This is partially inspired by the $20 Christmas Gift thread.
Tell us about some tools that you bought thinking "Eh, for that price, I can pitch it if it doesn't work out" but ended up being impressed with enough to keep and use regularly.
I'll start:
I have a Kobalt (Lowe's house brand) screwdriver gadget that can ratchet in either direction or lock in both directions, has a magnetic bit reciever, and an assortment of bits (standard, phillips, hex, square and star drive) built into the handle. It is kinda gadgety for a hand tool, and I don't know how well the ratchet mechanism would hold up in high-torque applications, but I use it frequently. The ratcheting feature is nice, and I don't have to carry several screwdrivers when I'm working around the house. I liked it enough that I now have 2; one in my tool belt and one in the truck.
I think it was about $7.00