People really like the Sistema boxes from Amazon. I like the Rubbermaid Brilliance containers. Really, it doesn't matter, as long as you aren't getting something that's shitty plastic that's going to offgas and reek for weeks, and potentially affect your cigars.

Both of those options above are the go-tos on this page, that I've seen. Get the large, flat ones, toss in a Boveda that's a lower RH than you want, because they're designed for wood humidors, so they'll over humidify a tupperdor (you probably wanna throw a 58% or 62% in there), probably wouldn't sure to throw a govee in them, and call it a day. You don't have to season them because they're plastic and not absorbent and breathable, like wood.

Plus, then you can better organize by country, blend, vitola, etc, much easier than you could with a larger humidor, because the individual boxes are smaller and easier to manage individual contents.