I've searched a lot and didn't find steam distillers for sale here in Brazil. Strange, but... Go figure!
I can get deionizing filters for under $100 US here. These have a very low flow rate, though. The better ones cost between $100 and $150.
Reverse osmosis filters are pretty expensive. Simple 3-stage, 10 gallons/day filters cost over $400 US without a pressurizing pump (over $100 extra)!
From what I've read, RO filters are suitable substitutes for distillers. Chemists on duty, please confirm this!