Amazon.com: OWC 32GB (2 x 16GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with Mac Mini (Late 2018), 27" and 21.5" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S32P) : Everything Else
Restored Apple iMac Late 2015 21.5-inch - 32GB RAM, 1TB HDD, 3.2GHz Core i5 - (MK462LL/A) without stand (Refurbished) - Walmart.com
Best Buy: Apple 21.5" iMac® with Retina 4K display (Latest Model) Intel Core i3 (3.6GHz) 8GB Memory 1TB Hard Drive Silver MRT32LL/A