Been here over a year but this is my 1st deal, and I've tried it out myself.
With memory prices rising I can't find DDR3 desktop memory cheaper than this @ Play.com :-
PNY 6Gb (3 x 2 Gb) 1333MHz PC-10660 DDR3 240-pin DIMM for Desktop Computers
3 x 2GB DIMM's
Fully PC-10660 Compliant
JEDEC-Standard Dual Inline Memory Module (DIMM)
Case Latency 9
Power Supply: 1.5V ± 0.2V
Pure Power and Ground Planes
Gold PCB connector
DDR3 is the next generation of DDR memory. DDR3 memory features faster speeds, greater bandwidth, lower power consumption and enhanced thermal performance.
***NOTE - Even though the description on the Play.com site says they are 200-pin DIMM's I can confirm that it's a typo. I've ordered and received 240-pin DIMM's, (there are no 200-pin DDR3 DIMM's anyway, laptop DDR3 is 204-pin).***
Don't forget Quidco @ 0.5%