Are you looking specifically for a lever action .357 mag rifle?
Reason I ask is that as a rifle it's sort of underpowered and that ammo is hard to find and expensive unless you roll your own.
“that ammo is hard to find and expensive...”
Must be a Pennsylvania thing. I can’t go into any store in Oregon that sells ammo that doesn’t carry .357. All reasonably priced too:)
.357 is plenty for varmints, two or four legged. Also smallish game animals. It's got as much power, more actually, as .30 Carbine, which is used by many around here for hogs. Plus more and better defensive loads are available than for .30 carbine. For the two legged variety of varmint, it has the advantage of being a cowboy gun not an evil assault weapon, which in some jurisdictions is a consideration, yet it's quite effective as a home defense weapon.
You can shoot .38 special for practice. That allows for cost savings, and since it's a less powerful round, one not as likely to develop bad shooting habits, in spite of shooing a lot of rounds.
Expensive? Well what ammo isn't in these days Obama? But a quick check found re-manufactured .38 spl at $65 for 250 rounds. Less per round for larger lots.
But for comparison from the same site, and for the same brand (Fiocchi) and bullet type (FMJ) I found 50 round of .38 Spl for 18.57 and .357 for 18.97. Oh, 40 cents difference for 50 rounds. or .8 cent per round.
However I'll concede the "hard to find" virtually all of that ammo is back ordered on the site. But then again, so is the .45 ACP I ordered a couple of months ago.
Your thinking of a 357 in a handgun power sort of way.
There’s a difference between a 180 gr 357 coming out of a 4 or 6 inch barrel, or coming out of a 24 inch barrel !
In actuality, if you handload the 357 for rifle you can load it almost to 30-30 pressures, which makes the 357 out of a rifle quite powerful and deadly. The longer the barrel, the better and more thorough the powder burns, resulting in more velocity. I know guys that took whitetail deer with a 357 mag rifle.