Here's some nice looking Kingston memory for $120 per 512MB DIMM. The timings are pretty good, and if you are overclocking an AMD processor, wouldn't this give you about the same kind of performance you might hope to get out of PC3500 BH-5 memory? If you try to buy BH-5 memory off of eBay, it'll set you back at least $350 for 2X512MB
http://srch.outpost.com/product/3747836
http://srch.outpost.com/product/3747836