Best Buy: Apple 27" iMac All-in-One Computer 8 GB Memory 1 TB Hard Drive ME089LL/A
Apple iMac 27-inch 2011 review | Gadgets 360
Memory Upgrades for Apple iMac 2011 Up to 32GB
A-Tech 8GB RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010 27 inch 4-Core, Mid 2011 21.5/27 inch), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Module at Amazon.com
Apple iMac 27" i5 2.7 (Mid 2011) - Technical data and benchmarks
Apple iMac review (mid 2011) - The Verge
Apple iMac A1312 27 inch (1TB, Intel Core i5 2nd Gen., 2.7GHz, 4GB) Desktop - Silver - MC813LL/A for sale online | eBay
Amazon.com: A-Tech Components: Mid 2011 iMac
Install memory in an iMac - Apple Support
32.0GB OWC Memory Upgrade Kit For 2010-2011 Apple iMac
Install memory in an iMac - Apple Support
Maximum memory for 2011 iMac - Ask Different
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Apple iMac 2.5Ghz i5-2400S (Mid-2011) *No HDD/RAM* – MSU Surplus Store
iMac 27-Inch "Core i7" 3.5 Late 2013 Max RAM is higher than 32gb | MacRumors Forums