There's always encognito's plan: http://eccie.net/showthread.php?t=1649433 .
Prices in SA look like they are in the budget-minded range. A problem with inviting ladies from further away is that the cost of travel goes up, and they have their own cheapasses at home. Why travel to cheapasses? No, I'm not saying all RGV hobbyists are cheapasses - just acknowledging the OP's admitted cheapassedness. Houston has a wide variety of ladies and a wide variety of prices, but they also have plenty of hobbyists (with a wide variety of budgets) to pay the bills. No, I'm not saying who you should or should not invite - just presenting an opinion about why they may not come.
For any SA ladies reading this, SA to Laredo to RGV to Corpus to SA might make a fun road trip.