um, not to sound rude, but slikstik and groovygamegear sell stainless steel handles. i just don't want you buying anything and getting upset when it turns out it's something different than you expected.
we have a board memeber who makes stainless steel arcade parts too, but since he does one-offs, his prices aren't any better than slikstik. slikstik also makes aluminum tops, but i'm guessing you already knew that.
to sum up, slikstik is the best price your going to find out there right now unless you know someone who has a cnc machine, then you could probably get it done cheaper. but he's got to be a real good friend and not charge you for setting the machine up. then your only price would be the block of stainless he started with.