Aegis Calypto: $60
The Aegis Calypto (Greek for Hidden Shield) is a tuckable, appendix holster. The clip is directly under the trigger guard to allow for a very slim profile.
The holster is designed to be worn in the appendix area, however, I wear mine strong side to kidney carry. I can modify the holster with a stabalization fin for primary carry strong side or kidney.
From Garrett Industries: C, J, Standard, Heavy duty and P.
From G-Code: their standard clip.
Extra clips for the holsters is $14, per clip.