I purchased a Rivarosi tank engine on ebay for $15. It runs super smooth and is one of my main locomotives.They were available in On30, but that gauge died, and Ebay is flooded with them in the $100-$400 range. Heck, there's been one sitting on consignment, at my LHS, for $75.
I guess I'll be the oddball............... I don't really want one of them.