Used Lenovo ThinkCentre M73 Tiny, No CPU, HDD/SSD, RAM(DDR3), or OS Tested | eBay
CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkcentre M73 / M73E Tiny - A7 at Amazon.com
A-Tech 8GB Module for Lenovo ThinkCentre M73 Tiny Laptop & Notebook Compatible DDR3/DDR3L PC3-14900 1866Mhz Memory Ram (ATMS312960B30845X1) at Amazon.com
Restored Lenovo ThinkCentre M73 Tiny Form Factor Computer PC, 3.2 GHz Intel Core i3, 4GB DDR3 RAM, 250GB SATA Hard Drive, Windows 10 Professional 64 bit (Refurbished) - Walmart.com
Lenovo ThinkCentre M73 10AY008HUS Desktop Computer Intel Core i5 i5 4570T 2.90 GHz 4 GB DDR3 SDRAM 128 GB SSD Windows 7 Professional 64 bit upgradable to Windows 8 Pro Tiny Business Black - Office Depot