Here is a great place and pricing for flying hardware. These may not be as heavy duty as the PE versions, but the weights that we are using with DR cabinets don't call for that much over-kill, either. These are similar to what Nimrod Webber installed in his cabinets, without having to do all the cutting, drilling and grinding. They also come in 4 great colors, although I wimped-out and bought the black ones. The track hardware is also reasonably priced on this site:
http://www.pitposse.com/noname90.html