I have put up 4 Sony Walkmans for sale on eBay.  All of them are in excellent condition with the drive belts having been replaced in all of them except the WM-F100II, since I could not find an original drive belt.  Take a look at them and if you have any questions please message me here with a PM or on eBay.  Thanks.

http://www.ebay.com/sch/dmata173z6/m.html?item=330678799388&sspagename=STRK%3AMESELX%3AIT&_trksid=p3984.m1558.l2649&_trksid=p4340.l2562