Right now there are 4 deals from Amazon Resale, formerly Amazon Warehouse Deals, in Automotive › Replacement Parts › Engines & Engine Parts › Engine Parts › Expansion Plugs. 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.

Every item is a one-off, so the stock moves all day and new deals keep arriving.