Trans International (http://www.transintl.com/store/category.cfm?Category=9&RequestTimeOut=500) has announced the worldwide availability of up to 16GB Memory Upgrade Kit [4X4GB] PC-3 10600 DDR3 1333MHz SO-DIMMS for the latest iMacs.
TransIntl.com memory modules conform to Apple's stringent electrical and mechanical design guide lines and carry a Lifetime replacement Warranty. Also, you can trade in your iMac factory memory, 4GB Kit (2X2GB) for $52. Transintl.com offers:
° 16GB Kit [4X4GB] for US$488;
° 8GB Kit [2X4GB] for $248;
° 4GB Kit [2X2GB] for $108.