In March 2015 I could buy a "Corsair Vengeance RED 32GB (4x8GB) DDR3 PC3-14900C10 1866MHz Dual/Quad Channel Kit" for £259.99 [1]

Today, I can buy a "Corsair Vengeance LPX 32GB (4x8GB) DDR4 PC4-28800C18 3600MHz Quad Channel Kit" for £259.99 [2]

[1] https://web.archive.org/web/20150303141114/http://www.overcl... [2] https://www.overclockers.co.uk/corsair-vengeance-lpx-32gb-4x...