"Maybe you could take them from home."

Maybe for a traditional backpacker. Ultralighters might consider some of the freeze dried or rock mixes on the market to save weight.
http://www.quikrete.com/ProductLines/ConcreteMix.asp
You could set your stakes in your new 'camp-made' rocks, and carry them with you when you move on. Leave no trace, ya know.





<img src="/forums/images/graemlins/grin.gif" alt="" /> silly me.....i was only kidding about setting stakes in the rocks....they'd be really hard to pull out when you get home.