Need to know how to get a key copied

I only have one key for my 2000 Mazda Millenia and the dealer wants $90 to make a new one. If anyone knows how i can get one copied that will be cheaper let me know please.

im guessing this isnt the run-in-the-mill key that Wal Mart can cut eh? All i know is that my buddy with a different car that has those special keys was forced to go to the dealer.. thats why they charge what they do, because they can... %&#$((*$($) :(