As far as current production goes, I have noticed that Zastava lists the 222 Rem Mag as an option on their model 85 rifles. I have never actually seen one though.
"Dilly", I would say that if you happen to spot an older rifle in this caliber at a reasonable price you would do well to try to purchase it. Do not worry about ammo or brass. Properly head stamp brass always turns up at some point. Dies are readily available from RCBS at least , maybe others. Once you have the dies, you could use Ruger 204 brass until you spot some 222 Rem Mag brass.