iMac RAM Models 11.3 (i5 and i7 only) to 12.2 (8GBx4) | MacMemory.com
Apple iMac 21.5" Mid 2011 Intel Core i5 2.7 GHz 1TB SATA Disk 4GB RAM HighSierra | eBay
A-Tech for Apple 8GB Kit 2 x 4GB PC3-10600 Mac Mini iMac MacBook Pro Mid 2010 Late 2011 A1286 MD311LL/A A1297 MC511LL/A A1312 MC309LL/A A1311 MC812LL/A MC813LL/A MC814LL/A MC815LL/A A1347 Memory RAM
Basic Apple iMac with High Sierra OS | i-series processor | 4 Gb memory — Free Geek Twin Cities
A-Tech 4GB RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010, Mid 2011, Late 2011), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Module at Amazon.com