Today we're launching a new feature on the AnandTech Pipeline: Price Check. Here we'll periodically examine hardware prices and analyze what's behind price changes
Just a year ago DDR4 dynamic random access memory (DRAM) was rather expensive and was sold at a noticeable premium compared to DDR3. Today, DDR4 memory modules cost less than DDR3 modules cost a year ago and continue to get more affordable. Next year prices of DDR4 are expected to decline further as manufacturers of DRAM are gradually increasing production of memory in general and DDR4 in particular.
http://www.anandtech.com/show/9864/p...keep-declining
DDR4 Memory Down Nearly 40% in 6 Months, Expected To Continue
21st December 2015, 18:08
DDR4 Memory Down Nearly 40% in 6 Months, Expected To Continue 
