Do more checking around and research before you buy anything Talk with the local bonsai club, for starters.
http://www.absbonsai.org/USAClubs.html#TX
There are clubs in Austin and in San Antonio. Either will know where the best places to look in the area, or may be able to put you onto a member who sells off old stock. If you're lucky, one or the other will be having a club auction soon. That's a rterrific place to get spectacular bargains on quality starter material. I know there are some reasonably priced, extremely good sources of quality bonsai down that way.