Hear me out-
Buy 2 pre-owned games, get the 3rd free seems like 33% off, but it takes the lowest game, so unless they are perfectly priced the same you are not getting 33% off.
The buy 4 10-and-under for 20$ and the 2 5-and-under for 10$ is effectively 50% off if you can get them all at the max price, otherwise pretty restrictive and can normally only be used in person.
The 6+ pre-owned games for 30% is amazing. It can be used online or in person. The cheapest pre-owned games are for 1$, grab 5 of those bad boys and a game of your choice. Upon adding your 6th game, you are paying .70 per 1$ game, or 3.50 for a 30% off coupon. Of course if you are grabbing multiple desirable games, even less. As long as a game is more than 12$, you are saving money this way. Getting a hard to find gem for 30% feels pretty good.
I really haven't seen a deal better than this for some time. The current run of it ends May 2nd.
I want to hear your thoughts on this if this is something that has been considered or not, or of there are better deals.