How-To: Now's the right time to swap your old iMac's hard drive for a fast new SSD - 9to5Mac
Trying to upgrade my iMac (21.5-inch, Mid 2010) | MacRumors Forums
OWC SSD Upgrade Kits for 27-Inch iMac 2010
How to Upgrade iMac Hard Drive (2009, 2010, 2011): EveryMac.com
My 12 y/o son is so excited. Found him a pristine Mid-2010 27" iMac for $100. Going to give it the SSD upgrade but he's stoked to start recording music with it :
iMac SSD - 4mac
OWC 2.0TB 3G SSD and HDD DIY Complete Bundle Upgrade Kit for Late 2009-2010 iMacs, (OWCKITIM09HE2TB) : Amazon.co.uk: Computers & Accessories