Try eBay. I think I paid around $25 for the spare key for my '00 Grand Prix. It's a transponder key though so you'll have to program the new key to the car. If it's like my Grand Prix proceed as follows: start the engine with a working key. Shut off the engine and remove the key. Now immediately insert the new key and turn the ignition to the run position but don't try to start the engine. Watch the security light on the dash. When it goes off, within 3 to 5 seconds, turn off the ignition but do not remove the key. Now immediately start the engine. Your new key is now programmed to the car. HTH. -Jim
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