Noticed some gaps on the Austin area map, so here you go (including the second GW store of the area that isn't currently listed):
Store
Location: 2438 West Anderson Lane, Austin, TX 78757, USA
Name: Dragon's Lair
Contact: http://dlair.net/austin/, 512-454-2399
Community
Location: Dragon's Lair (see above), Sundays from 10am (except the first Sunday of every month)
Name: Austin Weirdnobz
Contact: FB group: https://www.facebook.com/groups/1479013842409796/?ref=group_header
Store
Location: University Commons Shopping Center 200 University Blvd, Suite 220, Round Rock, Texas 78665-1001, USA
Name: Warhammer University Commons
Contact: Their FB page is: https://www.facebook.com/profile.php?id=106129543203982&ref=br_rs