PLUG20

Intel 535 SERIES SSD 256GB, M.2 80mm SATA SSDSCKGW256H601 $87.20 @ warehouse_1_online eBay with 20% PLUG20 Code

Uses an M-keyed M.2 connection according to the picture - choose carefully if you're planning to use an adaptor to convert it into a 2.5" SATA drive…

EDIT : That may not be true, see discussion below. I think the drive really looks like this - https://yepo.com.au/media/catalog/product/cache/1/image/800x... - which means it's easier to convert to a 2.5" SATA drive if it's M and B keyed…

Original 20% off at selected sellers eBay post