If you are in the U.K. You can find these in the "Clearence Bargains" Argos clearence outlets, can't rember the price but they not expensive.
£9.99
I just binned mine a couple of weeks ago.
Don't bother with it as its

.
Better getting one of those marble track balls that logitech sells for £20. Unless you like abusing your fingers...
Target you say? Saw the same ones in JCPenny before Christmas.
Had a good laugh too thinking how

they are.
You know something, I went to Frys to get a ball mouse (my optical mice do not play will with Counter Strike) and checked the entire store and they don't sell them anymore. Everything was optical or laser.
Had to go to the 99c store for one.

Oh while I was looking in Frys gaming department they have some lightguns that was not LCD TopGuns or Act Labs. They were something else and looked small. Nothing on Outpost.com - anyone seen them before?