contact a local nursery supply company and ask about having them order some. since they're regularly getting shipments from various manufacturers, shipping isn't as likely to eat them up. in lieu of the pebbles, you can just use lava rock readily available at a hardware store or landscape store. The only thing with them is you may need to crush the chunks into more usable sizes.
Net pots . . search around, try Ebay. I think you can get 2" pots for 0.20 - 0.25 per piece. just watch the shipping charges.
If you happen upon a gold mine, post it here for others to take advantage of.

Save the postage and drive to Bristol, PA.
Do a google search for HydroFarms East. They have everything you need.