I wouldn't pay over $100-125 for one. I'm a huge sensitone fan. But if going Pearl steel, I might instead opt for an old 10 lug 6.5x14 Export steel snare, which I would also not pay over $100 for. Maybe even find a good one for $85. Those are actually really decent, been on more recordings than many of us know, and kind of have a cult following like the old CB700 steel snares.
Sometimes we forget that there have been quite a few iterations of the "Sensitone" snare drum over the years. Here's a beautiful Sensitone I had back in 2004. The tube lugs and die-cast hoops were standard issue for this model! I can see this version selling easily between $200-$300, depending on condition.