Hey,
I bought some laptop ram a month ago for my MacBook Pro, but it was the wrong type. It's been sitting here collecting dust ever since...
4GB (2 x 2GB sticks) of PC2-5300 DDR2 (677MHz) Laptop RAM for $50.
...and...
I have a sliver DS Lite that I bought a couple months back for a trip. I bought a Supercard thingy for it too, so it can play... err... acquired... games.
DS Lite + Supercard hack thingy for $75. (comes with all cables, plus 4GB microSD card, etc)