DDR4 8GB desktop DIMM (single, non-ECC) typically costs $36.81 less than DDR4 16GB desktop DIMM (single, non-ECC) on eBay right now ($33.17 vs $69.99 median asking price, item + shipping). Per GB, DDR4 8GB desktop DIMM (single, non-ECC) is cheaper: $4.15 vs $4.37. Prices from filtered US eBay listings, checked twice a day; asking prices, not sold prices. How we price.