Ebay has dirt cheap deals on DDR3 memory.
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16GB 4x4GB PC3-12800U Dell OptiPlex 7010 7020 9010 9020 990 980 790 Ram Memory | eBay
Dell OptiPlex: 390, 790, 980, 990, 3010,3020,7020,9020, 7010, 9010. - Elpida, Crucial, Dell, G.Skill, Ramaxel, Etc. MAKE SURE YOUR SYSTEM WILL SUPPORT THIS RAM. We will respond promptly to your inquiry.www.ebay.com
And, for those that use DDR4, there was 32 GB on sale for about $30. I offered them $20 and they took the offer within a few minutes. I did offer to send them 4 x 4 GB of RAM back (as they were the 'PCs for People' group) but they declined my offer saying they were no longer interested in selling 4 GB sticks of RAM.
That's for my cheap refurb test box that turned into a retro gaming box. When I do the switch, I'd offer send the old RAM to anyone in the US that somehow needed them (assuming that I remember.)
Yeah it's hard to beat the deals Ebay has if you're willing to look imo.