need 1 stick PC3 12800

Had installed a triple kit 3x2GB OCZ 1600LV6GK XMP edition and need one more single 2GB card. Finding this impossible to find in UK as they only want to sell in kits. Any other brand with same specs?
Can anyone help.
tks

you will probably have to go with a different brand for the 4th stick. I dont see any non-kit OCZ DDR3 ram so far.

Tks. I got replies today from Overclockers UK, and Aria who both said they do not stock singles. Will have to rethink this one.
cheers

PS. Looking at intel and Crucial, max ram on this board is 16MB but must be in single,dual,triple interleaving. So by adding another 2GB to 4th slot on board will not really help.
Crucial do have the single sticks for abt £47. But I am probably looking for new 3x4GB kit.