How about using the selection box to allow multiple searches to be turned on or off. If you have a lot of searches it is a pain to have to do them all one by one, especially if you have to scroll down the screen each time.

I like 2004AD's idea, so I second the motion. I'd add that the search results might include the shipping costs when they are posted. For cheap books etc, that is often an important part of the cost- hard to snipe without opening each one to check the ship costs.