I agree with JWChesnut - I use mostly 8-frame, medium equipment, but I've still kept most of my 10-frame equipment, and even a few 10-frame deeps. I even have bees in a deep, or two. Mostly I use 10-frame supers to store my idle frames/combs in - they hold more, so it's more economical, especially since I don't run bees in most of my 10-frame gear. I've also cut many 10-frame supers in half on the band saw, glued and fastened new boards on their sides, and created many 5-frame nucs. Having a few deep supers is also handy when someone wants to give you bees on deep frames - you have a place to put them. Sometimes customers ask for nucs on deep frames. I've also built a few expansion rims, about 3" deep, and with their own frame rest rabbet's, if I place the rim above the medium super - I use the rims frame rests, though this is not necessary if I put it below the super. Sometimes above is better, and sometimes below is.
I have accumulated quite a bit of odds and ends. I was even gifted a vintage zinc queen excluder, just recently. I'd read about them in older literature, but this is the first one I'd seen in person. I don't believe this one was ever used, it has no traces of beeswax or propolis on it. I have also acquired some molded plastic clamshell frames, both deeps and mediums. They're some of the most durable plastic I've ever seen used for beekeeping equipment. With a minimal clean-up I've put some of them back into service. A few are a little warped, but all I've seen are still usable. They've been exposed to our desert sun for a very long time -- amazing.