Yard sales, thrift stores, and such have always been my primary source for containers. Even dollar stores can have some items which can be useful as pots. Lately though, I have a renewed energy to create things from "nothing". This past year I did a lot of pruning on trees which have been giving too much shade and also cut down a few trees for firewood. So I've been working on crafted pots from branches which were not very suitable as firewood but don't what to burn in the firepit or throw in the compost. Will post pics when I unload my garage in a couple months. Meanwhile I'll post such in the ideas forum as I put one together (with pics) over the next week or two.