botach has them for 12.95 ea and free shipping...
I have never had a problem with Botach. I've ordered everything from ACOG's, mags, gear, etc.
and there are these on GB, however if you think you may want some, act fast. this morning he had 987 10-packs. he has sold half of them in 12 hours...
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=322781357