If you find a source, list it here with all the info you can, links, description, price, part number etc.
http://www.ryderfleetproducts.com/cgi-bin/ryderfp/products/srm/oid/127135/pn/Idler-Pulley-Steel-Flat-2.9/erm/product_detail.jsp
http://www.mcmaster.com/#
http://www.motionindustries.com/motion3/jsp/mii/index.html
http://www.grainger.com/Grainger/wwg/start.shtml
http://www1.mscdirect.com/cgi/nnsrhm
https://www.surpluscenter.com/powerTrans.asp?catname=powerTrans
Here is a good source for belts
http://www.vbelts4less.com/K-Section-Micro-Rib-Belts_c_105-4-1.html
Bob