You've got a few options for getting a replacement. The most reliable (but often most expensive) route is going through your local Suzuki dealer. They can cut and program a new key specifically for your car, but be prepared to show proof of ownership. Alternatively, you could try an independent locksmith that specializes in car keys. They often have the equipment to handle older models like yours and might be a bit cheaper than the dealer. Just make sure they're reputable and have experience with Suzuki keys. For a 2008 model, a locksmith or dealer is probably the safest bet.