Right now there are 37 deals from Amazon Resale, formerly Amazon Warehouse Deals, in Electronics › Computers & Accessories › Computer Components › Internal Components › I/O Port Cards. These are inspected returns and open-box items that Amazon sells and ships itself. WarehouseHunter puts each one next to its current new price, so you can see what you save at a glance.

Brands with the most offers here: ASUS, QNAP, 10Gtek, Deal4GO, Dell. Every item is a one-off, so the stock moves all day and new deals keep arriving.