Micron 4GB PC3L-14900 DDR3-1866MHz SoDimm Non-ECC Unbuffered CL13 Single Rank Ram Memory Module MT8KTF51264HZ-1G9E2 at Amazon.com
4GB (1x4GB) DDR3-1866MHz PC3-14900 2Rx8 SODIMM Laptop Memory by NEMIX RAM at Amazon.com
4GB (1x4GB) DDR3-1866MHz PC3-14900 Non-ECC UDIMM 2Rx8 Desktop Memory Module by NEMIX RAM at Amazon.com
A-Tech 4GB Replacement for HP 708633-B21 - DDR3 1866MHz PC3-14900 ECC Unbuffered UDIMM 2rx8 1.5v - Single Server Memory Ram Stick (708633-B21-ATC) at Amazon.com