It can be expensive to buy original drives, especial 2.5" SAS drives for a RACK or Prof Tower Server,,, but here are some cheap wayes.
Link - x3650 M2 M3 M4 Drive Caddy Tray : http://amzn.to/2nfW6mj
Link - ServeRAID M5015 SAS/SATA Cont. : http://amzn.to/2oadf2r
Link - M5000 Advanced Feature Key : http://amzn.to/2naoxTu
China : https://www.aliexpress.com/item/Free-Shipping-46M0930-46M0931-for-IBM-M5014-M5015-ServeRAID-M5000-Upgrade-Feature-Key-RAID6-60/32789778163.html
Link - System x X3650 M3 : http://amzn.to/2nFy2NA
My PlayHouse is a channel where i will show, what i am working on. I have this house, it is 168 Square Meters / 1808.3ft² and it is full, of half-finished projects.
I love working with heating, insulation, Servers, computers, Datacenter, green power, alternative energy, solar, wind and more. It all costs, but I'm trying to get the most out of my money, and my time.