Brownells has a sale going on factory Glock mags for $18.99 each. Use coupon code L7Q for free shipping over $100.
http://www.brownells.com/magazines/...=affiliate-_-Itwine-_-Avantlink-_-Custom+Link
http://www.brownells.com/magazines/...=affiliate-_-Itwine-_-Avantlink-_-Custom+Link