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.