Brownells. Midway. Cheaper Than Dirt.

All places i have bought magpul items. You can search between the 3 and see who has the sales. Sometimes you can find coupon codes to reduce the price.
Use these if you buy from midway until February 14th...

$10 off $50 use AR1510
$15 off $100 use AR1515
$25 off $200 use AR1525
$35 off $300 use AR1535