Just scored an old Trek 'Professional Series' USA with 531 tubing, investment cast lugs and shimano 105. Price? Free from someone that I mentioned that I liked old road bikes
Seems like I got my $ worth out of this one, it had been serviced a few years back, so the grease isn't dried up, and everything is already set up to go, and the tires just aired right up... but I am missing the headbadge though. Have to keep an eye on eBay for one.