I would say Manzanita-Driftwood com is a good place to try. I've read good things about it, have an order placed with them. It's just been stuck at the same USPS center for almost a week now, not sure if it's USPS or MD's fault though. USPS has been a complete nightmare lately, all of my orders have been taking weeks to arrive.
I'm looking for some little twigs to accent this scape - here is the rough mockup I'm working on. The issue is that I have dragon stone still in the mail, so I can't really even get started scaping. I may not need twigs - it will be a 40b and I don't want to overcrowd it. I thought maybe some twigs that accent the root system would be good.
Well I have a whole box of different size pieces, so if you want some I can PM you with some pics. If you want to wait until your rock gets there that's fine. Either way if you haven't you should start soaking the manzanita. Might take a week or two to sink.