I use Bob Gloris, my regular A&P/IA at KRYW. His number is (512) 733-3137. He's done a few pre-buys for other people that have asked me if I knew somebody. He does all the work on my plane too. It's a short flight to KGTU or even KAUS.
Bob actually did the pre-buy on my 150. I didn't realize he was still at it, he's a really good guy as well.