Where would I go to buy an electromagnet?

[Quad]

i need to get an electromagnet for a physics project but i'm not sure where to find one.
would radio shack sell it? home depot?
any other ideas?

thx in advance

 

[Triumph]

McMaster Carr
Remember that place, they sell pretty much EVERYTHING.

 

[WW]

Edmund Scientifics has a lot of cool stuff (ok, a lot of geeky stuff)

electromagnet
another