Like you, just got a new to me .357. I ordered a new wrench from the factory, cost $32 plus $3 shipping. You do know the wrenches are calibre specific, right? Been two weeks but it hasn't showed up yet. I hear it takes about three. Asked them about barrels, a new 6in was $207, 8in $248. Their number is 607-336-1174, ext 21.
Several wrenches on ebay, and two different 8in barrels just sold for around $160.