I like buying Amazon Warehouse deals when the item makes sense to me. With larger items I think their quality control is higher, and the saving tend be bigger. The box may arrive super beat-up, but item is just fine.
My motivation is probably less about overall savings, but more about me feeling like I'm doing Amazon a favor. Weird, isn't it? I'm conditioned.
As a tangent: I've also purchased used that ended up being a return of a similar looking, but much less expensive item. So I just re-return it. In this case I assume it was fraud on the original return. With my patterns I doubt Amazon thinks -I- returned them the wrong item. Without customer context their job figuring stuff like that out would be much more difficult.
Ironically, my purchases on Amazon these days are almost exclusively books and ebooks.
I've been meaning to check out alternative ebook vendors too. Anybody have something they like on Android?
If you like SciFi/Fantasy, Baen sells ebooks direct with no DRM on their website in multiple formats and have for like 20 years. Some other publishers do this too like Image comics. Most don't though so you need to go through one of the bigger stores unfortunately.