First off, I'm sorry I can't help you with a local LFS. But to answer your other questions:
Rocks are heavy, and wood is bulky, so you're best off avoiding shipping if possible. You can find both here in the swap n shop forum if you're very picky, you can order driftwood from an online site with flat rate shipping (big al's or foster and smith) if you're less picky, and you can simply cruise around your backyard or the rest of town to find something (free) that strikes your fancy.
But as far as plants go, the Swap n Shop forum here will be by far your best bet. You'll have a very hard time finding cheaper plants at a LFS, and it's very unlikely that the LFS will have much that nears the quality of plants you can find here. Good luck, and welcome to TPT!