There is a very fair chance that your e-mail is filled with hundreds of "once-in-a-lifetime" or "today only" deals. If you are not careful, you can end up with a once in a lifetime credit card bill next month.
I am generally not hugely pre-occupied with deals and I do not wait for a particular season to buy something. If I am looking for something specific, I usually need it and I am unlikely to spend months analyzing what deals are out there.
There are some exceptions to that, most notably with backup optics (see my earlier post on Primary Arms) and tools.
I have a good assortment of tools to use, but I have been keeping an eye out for deals on Fix-It-Stick kits since I like to have a few spread around different bags/backpacks/etc. It turns out that I am pathologically incapable of remembering to move one from bag to bag, so I ended up accumulating a few here and there I am picking another one up this time since they have a healthy Black Friday discount going on: https://bit.ly/3nTqzsL
They seem to have a site-wide discount going on. I primary use different kits from them All-in-One torque limits. This is not as precise of an approach as preset torque limiters, I think, but I like the flexibility.

Another type of a back up optic I found myself using a good bit is a SeeAll sight. I have talked about these in the past and it is another topic I need to revisit. Originally, I was somewhat unimpressed and thought it was a solution looking for a problem. Honestly, I still do, if you are looking at these at regular price levels. However, they have a 50% off deal going on at the moment and that changes thing a little bit. I'll have another video up on these in a bit since there has been some evolution with these. In terms of functionality, I think these are an improvement over iron sights, but they are not quite as fast on target as proper small red dot sights. SeeAll sights do have the advantage of being inexpensive, fairly robust (so far) and not requiring batteries. I ordered a couple to keep as spares and to use in an upcoming red dot sight test I am working on. https://www.seeallopensight.com/

With conventional riflescopes, I have not spent a whole lot of time looking at what is out there since I am not really looking for anything specific at the moment. However, I did fish out a very nice deal on the Arrowhead LPVO from SwampFox. You know my general take with LPVOs is to spend a little more money and get a little more performance, but if you budget is limited, between SwampFox Arrowhead and Delta Hornet you have very respectable options. I did a review on the 1-10x24 Arrowhead and concluded it is a well built scope. Brownells carries them, so technically I can use my affiliate links and all (https://bit.ly/312Wzle), but you can get these for less directly from SwampFox, presumable this weekend only: https://www.swampfoxoptics.com/arrowhead-lpvo-series?utm_source=ALL&utm_medium=email&utm_campaign=Black%20Friday%20-%20Friday%20-%20REG%20%28QQ9Yvc%29&_kx=UTi__uzrjA7GwaHSJLYYqDEXxFreT5Dj2Jq-lshpB4n4LOYEk2rl1gvnWUxO3t7y.XdaVQT

From a training standpoint, I have been spending a lot of time with Mantis products lately, most importantly the Blackbeard and Laser Academy. I really like them. I do not see any Black Friday deals right offhand, but but if you are looking for a better way to do dry practice, this is worth looking into:
https://mantisx.com/collections/all-items/products/blackbeard-the-auto-resetting-trigger-for-ar-15

Shooting support: I mostly use tripods from Field Optics Research for shooting (Pro32) and I even have a discount code for supporters, but they have a Black Friday deal that is better than my discount. 25% off is pretty nice: https://www.fieldopticsresearch.com/shopping.htm
The discount code is BF2021
The specific products that stand out to me and that I use are the following:
Flexlite Gunpod Vise:https://www.fieldopticsresearch.com/shop/Weapon-Support-Tripod-Mounts/p/FlexLite-GunPOD-FM-300F-x52099105.htm
High Angle Bracket: https://www.fieldopticsresearch.com/shop/Tripods-for-Shooting/p/High-Angle-Bracket---HAB-270-x49747654.htm
PRO32 tripod: https://www.fieldopticsresearch.com/shop/Tripods-for-Shooting/p/PRO32-MIL-ASFPL-System-x45153725.htm
ULP Panhead https://www.fieldopticsresearch.com/shop/Heads--QR-Plates/p/Ultra-Low-Profile-Pan-Head-ULP-x51054447.htm

While Primary Arms seems to have a sitewide Surefire sale ( ), the one Surefire product I use all the time is not there. Palmetto does have it discounted nicely though: https://bit.ly/3rdy3Je
I like momentary tailswitches and Surefire's E2T Tactician is the handheld flashlight I use more often than not. I keep on trying a bunch of other stuff and for handheld I use I keep on coming back to this one, so I ordered a spare: https://bit.ly/3lbzJPR

Triggertech: most of the recent AR-15 builds I have done had a Triggertech trigger in them, largely because I got a few during the last Black Friday deal. However, I really like their feel, so that is another thing that I am constantly keeping tabs on and try to have one or two on hand. Eurooptic has these at 20% off. The one I use most of the time is the adaptable model with flat trigger: https://bit.ly/3xoTmc0

US Optics: I have talked in the past about US Optics' budget TS product line. The only one of these I have any significant experience with is the 3-12x44 TS-12x and I happened to really like it especially for rimfire applications. Also, the existence of this design gives hope to my version of the MPVO concept. At this moment, this scope can be had for $350 which is a really good deal: https://bit.ly/3lbzfsO

S&B: given how much these cost, this is definitely not an impulse buy. Schmidt makes a significant number of different scope models and keeping track of them all can get kinda interesting. I have been looking at them here and there and there are a few models I really like. Somewhat controversially, one of my favourites is the 5-20x50 Ultrashort. It is hard to make very short scopes, but as I spend more time with various thermal clipons, I develop new appreciation for these. Unfortunately, this is also a model I do not see discounted very much. Europtic has a 12% discount on them right now which is ahefty some of money given how much these cost. If I were looking to pick one, the 5-20x50 with DT II turrets and MSR2 reticle would be at the top of my list: https://bit.ly/312VUAE

I'll add more stuff to this post if anything else that is interesting pops up.