Amazon has some options here... The first shares the same model number "22733523" as my non-functioning one. The '05 Grand Prix is listed as fully compatible in the item description, But amazon warns it is not compatible with my vehicle. Robot Check
The second was suggested by LouF in a similar thread as it comes with a tool that allows you to program it yourself without having to visit a dealer and dole out $100. Amazon 'claims' it is fully compatible despite a lack of compatibility in the product description...
Robot Check
Any thoughts/suggestions? Has anyone found a proven alternative? Thanks!