I did find some Crucial memory on eBay that is about $200 shipped for 2 x 1GB sticks. So now my dilema is a) Buy from a reputible dealer and get a "so so" brand or b) buy from an eBayer and get a quality brand.

My motherboard is a socket 754, so it can't support dual memory channels.

The good news is that the top of the line 754 chip, the Athlon 64 3700+, has finally dropped from $500 to $200. And it looks like I could still sell my 2800+ for $70 or so.