I am currently using an easton tent stake that I picked up at REI for 2.50$, I think. Here it is
. To cut it down, I used a small tubing cutter that I picked up from Lowes for about 5$. I also used it to cut some toggles out of some old arrows I had laying around, but I like the stake ones better. The tubing cutter works real good for making them, but a hacksaw would be fine too, although the cut may not be as clean.