Dollar store. One for am one for pm, so $2. Was going to post a picture, but can't seem to do it without a URL. They are a tower of transparent plastic in rainbow colors. I call the top clear one Sunday and go down from there. They hold a fair bit. They're practical for my situation, but mostly I picked them because they are pretty, lol.

Edited to add: Similar to this (but a lot cheaper): GMS 7 Day Pill Organizer | Stackable Tower | Large Rainbow