Where can i go to hook up my oldsmobile alero keyfob?

i bought an olds alero and it came with a keyfob to unlock doors, trunk, etc. that doesnt work. i brought it to my local mechanic and he couldn't hook it up. i brought it to a locksmith and he couldn't hook it up. they both said that gm uses a specific machine to hook up the keyfob.since oldsmobile is no more, where do i bring this thing to get hooked up? a gm or chevy dealer? and will they even be able to do that there? how much am i going to get charged?