Not just for pc hardware, but anything from electric toothbrushes to lawnmowers to HDTVs to MP3 players. Any bargain that you think someone else might be interested in.
I'll start off with this:
A Force 3d Freezer DHT 4870 512MB graphics card for R2600!
The cooler really works. Keeps the card around 20c cooler than most other 4870s.