I also find luck looking on porches and back yards. Check for auctions, garage sales, and craigslist, although I find that CL is rather overpriced here (then again, I am near Bloomington, IN and IU). If worse comes to worse, start knocking on doors.
And as far as low end and sports, if it's a Raleigh, Phillips, or other English "Sport" type bike, it might be heavy, but it certainly isn't low end.