Try gun shops, gun shows, pawn shops, garage sales, estate sales, on line auctions
Mossberg. They are in business, and have a website. Try Customer Service.
Check the receiver/barrel
Unfortunately only a Mossberg single shot rifle from that era would interchange. Your rifle was made between 1960-1968. If you contact Havlinsales through their website, they could advise you on the availability of a replacement stock.
Which Model. It could be a Mossberg, Savage, Marlin, Hi-Std or Colt. You have to state the model of the Revelation.
100 and up
Brownells has replacement stocks for the model 60. You can also go direct to fiberforce to get one.
IF the rifle has all sights, etc, has not had stock modified, there IS a modest collector's interest in the older Mossberg 22s. $200-$250 is an average price. They shoot VERY well.
Anything made by any other maker that has similar features.
Gun shows, want ads, internet
From Numrich. Their website is gunpartscorp.com. It Is item 448430A, sells for $48.30 plus shipping.
Gun shows,gun shops,on line sites,garage sales etc.
I would try the maker of my rifle first.