Where do garden centers, nurseries, and greenhouses get their cheap green pots, trays, and cups?... i.e. the disposable containers that plants are sold in?... heck, supplies in general.

I've googled every combination of pots, planters, plastic, wholesale, garden supply, nursery supply... etc. etc.

I've gotten a few hits, but the prices are, while affordable, high enough they're not what I imagine businesses pay.

Thanks!