If you're not watching C&Rsenal, you're wrong and you should feel bad.
Related to this video is one of the .25's that's in the "rare and/or expensive" category is the Mauser 1910. A lot of overlap there.
Amusing... I've got a Phoenix Model Raven 25. I've a line on a cheap Raven Model P-25. That just leaves Jimenez, Bryco and Jennings for shitty nickel-alloy .25 pocket guns. Altogether, likely cheaper than just the Mauser.
Unless some reader out there has a Mauser 1910 they'd just LOVE to part with for an insanely reasonable price...