Thanks for the replies, everyone!
A local shop happened to have a Colt Junior and a PSP-25 listed on GunBroker. The Junior ended without a bid, but the PSP-25 sold before I could place a bid. I stopped by and had a look at them both. That PSP-25/Baby Browning was unbelievably tiny! I'll be keeping my eyes open for another at a good price.
As for the Junior, I decided to take it home.
It's in pretty good shape with light bluing wear throughout, being just a little heavier near the muzzle and the rear of the grip. The grips will probably need to be replaced if I want it to look its best (one is warped), but it's mechanically sound and passes a function test. Inside, everything looks great. The mag isn't Colt, but I bought it as a shooter rather than a collector piece. I'll probably wind up buying a few Triple K mags as spares. I'll try to get a few photos soon!