As always, prices are affected by location and condition.
At that price, the M57 would barely get consideration here, even with box, papers, and in 95% condition. ANIB, maybe. The caution flags on the 25-2 are well-heeded. I'm with the $2K cash OTD gang.
.41 Magnum ammo is not a big deal, IMO. Moralem nailed it on LAX Ammo; I've shot at least 1000 rounds of it, and like it. If nothing else, it's great for reloading - new Starline brass. Reed's Ammunition & Research has a good range of .41 ammo, including the .41 Special, if you're into that.
Reed's Ammunition & Research, LLC