There are a handful of potential coupons like BOGOs, free stuff, discounts. A nice mixture of meh, maybe, and marvelous - you might get a few bucks off of some headphones, a keycap BOGO, or maybe a free keyboard.
For example: today I got a BOGO coupon for in-stock DCX caps.
If it’s anything like the last promo, the coupons are tied to an individual user and only good the day you “reveal” them - so if you think it’s a good one, go ahead and use it!
I checked with the BOGO, it includes child kits. So you can get a base kit and apply the coupon to a free child kit. Not that it’s a good deal at all, but it works.