Quoted from epthegeek:I looked into whether or not you could get an "Frozen Carbonated Beverage" machine for the home a few years ago. The general answer I found was no. They're apparently a maintenance headache and nobody wants to support joe home owner with one.
I bought a used Frosty Factory double bin frozen drink machine years ago. Not carbonated, but it makes great non-carbonated frozen drinks (like orange creamcicle, frozen lemonade, and blue raspberry). It also makes great frozen adult beverages that are always the hit of the party (like margarita, pina colada, and hurricane). Plus, you would be amazed at the drinks you can make up and freeze that turn out great (I have found that Fresca is the universal mixer and makes great adult beverages in the frozen drink machine). I have even been able to make a reasonable facsimile of the Grand Marnier and Grey Goose orange drink from Epcot.
I have had very little to do maintenance wise on the machine, and nothing that I haven't been able to do myself. They are a pain to clean, but I bought a case of commercial sanitizer and clean it like they do in the restaurants. Also, the thing is really heavy (like 300 pounds), so it is a pain to move around. I ended up building a bar height cart with wheels that it sits on to roll it from storage (I am pretty sure I am the only guy in the neighborhood with a frozen drink machine in his bedroom closet) to where I am going to set it up for a party. Of course, when someone borrows it, we have to deal with taking it out of the cart and carrying it to a truck or SUV, but with 2 people it is doable. If you get one, I would suggest you set it up in a tiled area (not on carpet) because you are going to have sticky stuff to clean up after every use.