My Dad also carried an M1 Carbine during cave clean up on Okinawa. I made a discovery the other day as I investigated M1 Garand availability for my next gin project (an M1 Garand in 35 Whelen with 20" barrel):
Original M1 Carbine sales out of the Civilian Marksmanship Program are completely sold out, and are now so rare that they are auction only if and when they become available, and Gun Broker prices for originals are sky high.
More, the current firearm and ammo panic buying, combined with Covid closures at CMP, has resulted in near zero availability for Garands, too. Gun Broker availability of Garands is still fairly good, but prices are going up.
My Garand bear repellant rifle is maturing into a potential small business idea. I'm now thinking of using the future prototype to market the concept in Alaska to compete with the lever rifles.