Try some of these
www.pricewatch.com (the best - learn this one)
Memory (go right to the company and save $$$)
Norton System Works 2k3 Pro w/Ghost:
XP Pro sw/p1 (OEM):
Remember, check each place for each item you need.
For instance - www.ussa.com had the absolute best prices on CD/RW drives and more. They were great on the phone and right on time with shipping.
If shipping is free, then go with the cheapest place. If not, "Add to Cart" the cheapest/lightest items first. Why, because some shipping calculators give you a break for add-ons. Also, shipping may be free and watch the tax add on for some companies now. They are doing it because the courts say they can. I have been charged for out of state taxes already (once).
Good luck - I have built 11 computers from new parts and more than 20 from company discards and other sources. Gave many away to those who needed them. Sigh, those days are gone...