Lock smith will be best bet. - $
Replacement key from dealer - $$
Really good drill bit - wont do that myself but cheapest fastest way. No more lock!
Before drilling could try tapping a small flat head screw driver in the lock to release it. But that's only if you have a drill handy to get you out of that mess if it doesn't work. I'd leave it to a lock smith. They can sometimes make a key onsite. Worth a try.