12x Kingston KVR13R9D4/8I - 8GB ECC RDIMM, 2Rx4, PC3-10600 (1333 MHz), CL9, 1.5V
2x Kingston KVR16E11/8HB - 8GB ECC UDIMM, 2Rx8, PC3-12800 (1600 MHz), CL11, 1.5V
2x Crucial CT102472BD160B - 8GB ECC UDIMM, PC3-12800 (1600 MHz), CL11, 1.35V
Initial price is 40 USD per piece, but any reasonable...