This Chevron fuel system cleaner has fantastic reviews, and is less than $7 for a 20 oz. bottle today. It rarely sells for under $11. [Chevron Fuel System Cleaner, $7]
We typically post larger tool set deals, but if you need a simple first set of socket wrenches, this is a great bargain. [Craftsman 30 Piece Socket Wrench Set, $15]
Hopefully you don't have to use it often, but this fully-stocked first aid kit is a steal at $11. [AAA 85 Piece Commuter First Aid Kit, $11]
Update: Sold out at that price, but the step-up 121-piece model is also on sale for only a few bucks more.
This is a great price for 250 tools no matter how you slice it, but the three-drawer case seals the deal. [Craftsman 250 pc. Mechanics Tools Set with 3 Drawer Case, $150]
We've narrowed the list down to five, so don't forget to vote for your favorite smartphone car mount !