You have three options. Hill Country Hobbies is the best one. It's run by a retired AF vet and he gives a 10% Military Discount. He has all the good new stuff plus some older stuff. There is even a consignment section where you can find some good bargains.
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=hill+country+hobbies+san+antonio&sll=37.0625,-95.677068&sspn=34.396866,78.662109&ie=UTF8&cd=1&hq=hill+country+hobbies&hnear=San+Antonio,+Bexar,+Texas&ll=29.550164,-98.644009&spn=0.070037,0.153637&z=13&iwloc=A
Second option is Dibbles. It's an old style hobby shop with lots of old stuff with some new kits sprinkled in. Lot's of train stuff and gaming/fantasy stuff too. Kinda hard to find.
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Dibble%27s+Hobbies,+San+Antonio,+TX&sll=29.550164,-98.644009&sspn=0.070037,0.153637&ie=UTF8&hq=Dibble%27s+Hobbies,&hnear=San+Antonio,+Bexar,+Texas&ll=29.476666,-98.544273&spn=0.070088,0.153637&z=13&iwloc=A
Third is HobbyTown USA. A pretty good HT, but kit prices are way to expensive. Best selection of paints and tools, though.
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=hobbytown+san+antonio&sll=29.476666,-98.544273&sspn=0.070088,0.153637&ie=UTF8&cd=1&hq=hobbytown&hnear=San+Antonio,+Bexar,+Texas&ll=29.53045,-98.484879&spn=0.140101,0.307274&z=12&iwloc=A
Too bad I'll be in NYC Saturday, I'd meet you there. Have fun and if you go to Hill Country Tell Gary Scott sent you.
Satch