Palmetto State has 30 round Troy battle mags on sale for $4.99 + shipping. I just ordered 20, and shipping was $12. Not a bad deal.
http://palmettostatearmory.com/inde...troy-battle-mag-with-pink-follower-for-ar15-s
http://palmettostatearmory.com/inde...troy-battle-mag-with-pink-follower-for-ar15-s