This isn't a special deal or anything, but I'm finding that a lot of Supermicro accessories are cheaper directly from Supermicro's store than on eBay or other retail places. Some examples:
HDD/SSD screws:
https://store.supermicro.com/server-accessories/hdd-tray/screws-3-5-labels-mcp-410-00005-0n.html
https://store.supermicro.com/server-accessories/hdd-tray/screws-2-5-labels-mcp-410-00006-0n.html
I/O shields:
https://store.supermicro.com/server-accessories/io-shield.html
I just ordered some stuff, and shipping was very reasonable.
HDD/SSD screws:
https://store.supermicro.com/server-accessories/hdd-tray/screws-3-5-labels-mcp-410-00005-0n.html
https://store.supermicro.com/server-accessories/hdd-tray/screws-2-5-labels-mcp-410-00006-0n.html
I/O shields:
https://store.supermicro.com/server-accessories/io-shield.html
I just ordered some stuff, and shipping was very reasonable.