Edit: Sorry thought these were Pmags. They are Promags. I edited title as well
http://gunmagwarehouse.com/sale/
30 round $6.49 ea plus shipping
They also have 20 Round ones for $5.49 ea plus shipping
I have never ordered from them before but I just order some 7.62 AR mags so we will see.
Got my tracking number this morning also. I have had a brick on order from Sportsman Guide since Nov. 2012! They keep moving the ship date.... Thanks to the OP for the original heads up....