I'm lookin for about 1,000 1-gallon nursery pots for a homescale nursery. Given this requirement, what is a good source?

I don't much care for used ones since they can be a pain to separate without breaking, however, if there is a vendor with a good deal on used pots (I don't want to rummage around the wayside to find hundreds), then I'd like to be informed. I live on the west coast (southern California.) So preference is for cheap, new, durable pots.

Thanks for any and all leads.