New 16GB 4x4GB Memory Apple iMac (21.5 and 27-inch, Mid 2011) PC3-10600 at Amazon.com
Imac Hard Drive 1TB 2010 2011 High Sierra - Etsy
NEMIX RAM 32GB (4x8GB Upgrade) DDR3-1333 PC3-10600 204-Pin SODIMM Memory for Apple MacBook Pro Early/Late 2011, iMac Mid 2010 27 inch 4-Core, iMac Mid 2011 21.5/27” , Mac Mini Mid 2011 at Amazon.com
RAM imac 2011 ddr3 | eBay
Memory RAM Upgrade for Apple iMac 27-inch Mid 2011 4GB/8GB DDR3 SODIMM | eBay