PC3200 Samsung 1GB: $210 on pricewatch.
Now, really that means $300 by the time you get to a trustworthy store, but still...not too bad.
$276 lowest for 1GB ECC PC2700...also not too bad.
Most likely the RAM will not be the most expensive part of systems it will go into, or the second will be very close.
SCSI RAID...lots-o-money
Xeons/Opterons...lots-o-money
For a server or high-end workstation, $500+ on memory ain't so bad. Not to mention, if you can, it'd be best to get a 4-slot mobo and 4 sticks of the same 512MB sticks.
Damn, I looked at Crucial's site. A grand for a 1GB SODIMM I can sort of understand, there's a very very small market for those. But 565 dollars for a 1GB unregistered non-ECC module? Even with a 100 dollar coupon, that's frigging expensive, and it's only PC2100. Their ECC modules are only 390.
The market for 1GB sticks is as low or lower right now. Only $5000+ servers are really using them, and many of them still don't need that much. However much you may want to make that 4GB limit...not many other people do. It also isn't helping the prices that the best mobos on both sides are dual-DDR.