I dont really know where you can get the ram your after ( sorry ) but about the cheapest thing...prices go up and down everyday so its just a matter of being in the right place at the right time
Try: RAM Computer Supply Inc. (416) 398-1100
Ontario Location but will sip via Courier. Can supply virtually any memory you may need. May not be cheapest - but usually can come up with RAM for older computers, ie. 486 or 586 P1 models.
what kind of ram do you need? is it pc100, pc133, pc266, pc2100, pc2700, or edo (rofl if u use edo u need more than ram, lmao) i would check at www.bestbuy.com or www.newegg.com