Good to know it's not just me. I've used a wrench so many times on a few jars that there were actual holes in the lid, lol. I had one custom mix in a Testors jar that I used for lips and face shading (it actually began life as a Sinestro-skintone mix) and the metal lid was stripped so much I had to buy these little glass jars from the Dollar Tree and transfer over as much as I could to save. The jars are actually pretty nice, I plan to use them next time I try to mix colors. They're usually in craft section of the DT. You can get cheap palettes there as well.
Apparently Hobby Lobby is ending their 40% off one item on Feb 28th, which really sucks. Going to need to use up my gift cards and buy a bunch of paints before then. 40% really made a $25 gift card last.