I am in the process of taking 17 WSM rimfire, cutting off the shoulder and dumping the power and loading a 65gr .251 bullet over blackpowder, it is a heck of a process.
I have found a few rounds in the odds and ends, around $2 each for 25 Stevens Long and $1.5 each for Stevens Short at gun shows, if you buy a box of 50 you are looking at $150-200 is seems now. I have found a few where it was just in the mixed ammo box and they did not know exactly what they had, got 8 rounds of Long/Short for $2, he only wanted $1 but I only had a toonie.