Kel-Tec P3-AT, as mentioned, as well as the Ruger. Considering used? Might open some more possibilities. I carry a Bersa Thunder, but it is hardly a "mouse gun", being bigger than many 380 pistols. That extra size gives it the advantages of being easier to shoot accurately (longer sight radius and better handhold), deliver a little more punch, albeit negligible, due to the longer barrel, and of holding an extra round. The main disadvantage is it's larger size.
Anyone know the going rates for AMT Backup/Backup-II pistols on the used market?
Also, since you didn't rule out revolvers, you might come across some used S&W or Rossi .38 Special models that can be pocket-carried. I used to carry my Charter Arms Undercover that way a lot, when I didn't wear jeans as often. Jean pockets are a tad too shallow; don't fully cover the butt (of the gun!)