u/Meximanly

If you are at all interested in the artwork for ATLA or TLoK, you should be aware that the art books are all currently available for 46-50% off digitally on the Google Play book store. It's very possible that they're on sale on other digital store fronts, but I only know for sure it is on the Play Store.

It looks like the digital omnibus editions are also currently on sale for a similar discount if you are interested in that as well.