For those willing to take a risk on used/decommissioned server RAM, there are some great deals to be found on Ebay. I've picked up 4 sticks recently with great results. Single sticks of registered 16GB RAM (2Rx4 PC3L-10600R 1333Mhz ECC) are going for $50/each. At times, lower prices can be found on multiple sticks, such as $85 for 2 16gb sticks, delivered. While buying used RAM can be risky, so is buying a used Apple PCIe SSD, which has been an upgrade for many CMP users.. No matter for you look at it, $50 per 16gb stick is too good of a deal to pass up.