I just got a FREE load (easily over $100 value) right here in Portland OR.
The last vendor I got new ones from was on eBay, SupplyHut, $40 for 50. Not .50 but I think the shipping was free. They were what I call China boxes. Lightweight, flimsy. It seems they are all that now unless you buy from Uline, but there you really get stung by high shipping cost.