I don't wanna cause any trouble, but I will state that what you guys said about chert is true in your neck of the woods (and mine too), but not necessarily so in Utah. I have picked up literally hundreds of pounds of very nice chert, jasper, agate, pet wood, and quartzite on BLM land in WY, UT, NM, CO, AZ. You need to remember that their erosional regime is very different than ours and stuff on the surface may have only been exposed for a little while, not decades or longer like we expect in the east. Anyway, point is when you are learning you are going to go through a whole lot of rock and the cost of buying it is ever increasing. Some states do infact have really nice stuff just laying around!
Matt