Something you can consider, although somewhat primitive is displacing the metal with a torch & punch. Stainless isn't going to cut readily like carbon steel due to it's content of nickel & chrome, but you can heat it glowing white hot with a torch & drive a punch thru the heated area. Sure, it's not rocket science, but it will work. Then, you could use a carbide burr to clean up the holes.
Like Joe said, don't spend big bucks on bits if you don't need to. It's not like you're making a fortune on the work anyways.
I would try the displacement method if you can't find a local shop to shoot the holes with a plasma cutter for $ 20 or so.
Just a thought. I wouldn't say anything if I hadn't been there with a "freebie" that ended up costing me a bundle.
Good luck. S.W.