You're pretty much @ low retail, need to go off road to get much lower, I'd buy these parts new, hell cheap azz me I'd by them used, the canadian thing well that's your issue..
www.ebay.com/itm/2x-Corsair-Desktop-Gaming-Memory-CMXG2GX3M1A1333C9-2GB-2x4GB-DDR3-1333MHz-NEW-/370739542430?pt=US_Memory_RAM_&hash=item5651cc799e
http://www.ebay.com/itm/Cooler-Master-eXtreme-RS-500-PCAR-A3-/261159569891?pt=PCA_UPS&hash=item3cce52c9e3