maxupgrades.com: Single SSD Drives kit for iMac 27 inch 2012 Models with SATA Blade SSD Module / Heatsink/ Power Cable and DATA Cables for [SSD + HDD]
Installing additional SSD in Mid-2010 27" iMac
iMac Mid 2010 SSD Upgrade - YouTube
Amazon.com: OWC 1.0TB 3G SSD and HDD DIY Complete Bundle Upgrade Kit for Late 2009-2010 iMacs, (OWCKITIM09HE1TB) : Electronics
How to Install a 2.5-inch SSD in the SSD Drive Bay of a 27-inch iMac Mid 2010 (Updated) - YouTube
Amazon.com: OWC SSD Upgrade Kit for 2010 27-inch iMacs, Mercury Electra 1.0TB 6G SSD, 18" SATA III 6Gbps Data Cable, SSD Power Cable, Installation Tools and iMac Screen Adhesive Tape Set :
iMac 27" 21.5" 480GB-1TB SSD Upgrade Service 2010 - 2019 Inc Data Migration | eBay
Amazon.com: OWC/Other World Computing Internal SSD DIY Kit for Apple 27" iMac 2010 Models : Electronics
Finally did the HDD to SSD upgrade in my 2010 iMac 27" - Pics inside - RedFlagDeals.com Forums