Most likely, if you're using gas (natural or LP) you won't need 220v... that would only be if the heating came from electricity.
I use an Ambex 2K. Once you know the roaster, smaller batches of 1lb to 1K are easy enough. Maybe you can find something like that, used. I bought mine used 10 years ago, roast ~100#/mo. and it has never needed repairs, only normal PM.
You might also consider Mill City Roasters. The have a very capable 1K roaster.