I also use the rock busters. I got mine from Cabelas. I about 4 years, I've managed to bust one. That was when someone tried to pound one into sandstone. They work great in sand. I had them stashed in my kayak on a recent flat water trip on the Colorado. We didn't need the tarp, but they sure came in handy to secure my wind in sand on a windy evening.
"We are all visitors to this time, this place. We are just passing through. Our purpose here is to observe, to learn, to grow, to love....and then we return home."
Australian Aboriginal Proverb