Don't get me wrong, you end up paying more for the suppressed than you would have to for a proper supressor and Glock. I was just speaking academically. A great part of the equation is what use you plan on having for the device. Is it for more pleasant target practice, for occasional use on a duty weapon (indoors for instance), for the sake of having one, etc. If you have the extra money to spend and just want a suppressed pistol, go for it. Being in a Class III state, you might want to start with a really quiet gun like an integrally suppressed Ruger .22 rifle or pistol. Here are some manufacturers of Class III stuff:
AAC
AWC
Gemtech