Winchester/USRA 70 WSSM Fwts typically sell for over $1K. There was a stainless parts gun that recently went for $2,125 on GB.
Although Winchester/Olin still catalogs three (3) factory loads, they must be seasonal runs, as I haven't seen any on local dealers' shelves for at least 3 or 4 years.
Winchester/Olin only cataloged the 25 WSSM for two (2) years, so it is less common than the 243 WSSM and much less common than the 223 WSSM.
I am a 25 WSSM fan, still have fifteen (15) rifles, a few thousand rounds of loaded ammo and a few thousand more new pieces of brass to feed them well into the future.