I bought my Sony SRF-M37V new about 2 years ago, and have had no problems with it...the eBay auctions I've seen lately are selling refurbs for only a few dollars less than a new one (around $30).
About a year ago there was a sale of a stock of slightly used ones - AmEx logos on them, given away at the U.S. Open, and the prices were much better...around $12-$15 each, or about $21 for 3. Wish I'd picked some up at that price.