4GB Memory for 2011 MacBook Pro, iMac, and Mac mini
OWC 8GB PC3-12800 DDR3L 1600MHz SO-DIMM 204 Pin CL11 Memory Module Upgrade Compatible with iMac, Mac Mini, and MacBook Pro (OWC1600DDR3S8GB) at Amazon.com
Samsung 4GB DDR3 PC3-12800 1600MHz 204-Pin SODIMM Laptop Memory Module RAM. Model M471B5273DH0-CK0 at Amazon.com
OWC 8GB DDR3 1066 MHz SO-DIMM Memory Module (Mac)
16GB DDR3L SDRAM 1600 MHz PC3L-12800 1.35V SO-DIMM 204-pin For HP ZBook 15 G2 | eBay
OEMPCWorld.com: 204-pin DDR3 SO-DIMM test head for RAMCHECK LX base tester.