I have purchased 3 rocks from LFS, (tulfa rock?) and they were very expensive. Mainly I got them because the shapes were just to cool to pass by. Caves, nooks, crannies...
All the other stones I have I got from a landscaping/pond supply local place. They let me go thru their pallets, take out what I want, and essentailly charge me $5.00 - every time, regardless of what or how much I get. I've got some really cool slate that I got from them.
As far as online, I don't know if I would do that. Just think of the shipping nightmare. I bet it would be expensive. If LFS rock is high dollar - this would be high dollar + shipping.
I also bet there wouldn't be many large pieces left by the time you received your order. I mean, would a distributor really spend the money and the time to pack a box of rocks with lots of bubble wrap or "peanuts"?
I'm just a teeny bit irritated at the moment. Sorry if the tone is offensive to anyone. I come in peace, really.