Used bookstores carrying DAW?
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There is a four member Texas Thinger group; small but active: http://www.librarything.com/groups/texanswholibrarythi1
First ask there for advice.
Secondly, you can use the Local tab at the top and enter the city. You'll get a lot of libraries, but lots of bookstores as well. Just on the first page I found Kaboom Books
with phone and email contact info. I would inquire directly with your specifications. You might be able to pre-shop, either getting staff to send you inventory lists or even a photo of the science fiction shelves.
You can be more specific with your Local search using zip codes; I just searched by city. Sounds like efficiencies like these might help you gather many more books in the short time you have.
PS: Another glance at the Local page shows a Half Price Books
with a good review suggesting this store might be golden: "My favorite HPB for sci-fi and fantasy"
There are several active members who frequent that store, and they may chime in here later.
Paperback Exchanges - two locations, no website that I can find
Becker Books - one location, http://www.houstonbooks.com/
1/4 Price Books - one location, no website that I can find -- On a personal note, I went in one time and immediately turned around and left. The guy at the checkout totally squicked me out. Also, nothing in that store in 1/4 of the cover price, fair warning.
Yelp has a pretty good list: http://www.yelp.com/search?cflt=bookstores&find_loc=Houston%2C+TX%2C+USA