I have a variety of secondhand RAM sticks for sale. Most of them are for servers rather than PCs. Note the specifications well as some are ECC, registered, or both. Part numbers are supplied so you can confirm for yourself. All prices OBO.

• 8 x SK Hynix 8GB DDR4-2666 (ECC, Registered)

   

  • Part no. hma81gr7afr8n-vk
  • $40 per stick or $300 the lot
• 2 x Micron 8GB DDR3 PC10600 (ECC, Registered)
  

   

  • Part no. mt36jszf1g72pz-1g4d1dd
  • $30 per stick or $50 the pair
• 2 x SK Hynix 8GB DDR3 PC10600

   

  • Part no. hmt31gr7bfr4a-h9
  • $20 per stick
• 2 x Samsung 4GB DDR3 PC12800U

   

  • Part no.m378b5173db0-ck0
  • $30 per stick or $55 the pair
• 1 x Micron 4GB DDR3 PC8500R (ECC, Registered)

   

  • Part no. mt36jszf51272pz-1g1f1ba
  • $30
• 1 x SK Hynix 4GB DDR3 PC12800U

   

  • Part no. hmt351u6cfr8c-pb
  • $25

Shipping is likely to be around the $10 mark.