I went down to the building supply place and found a peice of slate I liked. It is like 3'x2' and weighs around 50lbs. I took it inside and the guys were trying to figure out how to sell it to me, because they sell it by the ton. Expensive stuff too, the guy said its like $395 per ton. They gave up on me and my rock and told me to just take it. WOOHOO!!! free rock! :dance
So while I was wandering around their yard, i noticed that they carry the same gravel as I use in my tank! Only that too is by the ton. I bought a 5 gallon bucket ($4.99) and they had me drive my Jeep up onto their huge truck scales. I got to find out how much my car weighs too! I loaded my bucket with rock, and drove the jeep back onto the scales. 40lbs of gravel later I paid $8.99 total.
Thats with tax and the bucket. I should have brought my own bucket. I think I got a great deal, cuz the same rock at petco is like $10.99 for a 10lb bag!!!