At Primary Arms next door in Texas. $34.99 limit of 2. These will not last long!
http://www.primaryarms.com/anderson-manufacturing-ar-15-stripped-lower-receiver-closed-ear-ar-15-a3-lwfor-um-closed
http://www.primaryarms.com/anderson-manufacturing-ar-15-stripped-lower-receiver-closed-ear-ar-15-a3-lwfor-um-closed