The GLOCK G25 and G28 are the .380's.
Due to the BATFE's silly import laws, they cannot be imported for anyone but law enforcement agencies. Once in the country, they are legal to own, but due to their size, not many agencies ever buy them.
The G28 is the subcompact and is the EXACT same size as the G26(9mm) / G27(.40) / G33(.357) / and G39(.45GAP)
The slide on the G39 is thicker than the others, but all of those models, as well as the G28, share the same frame.
The G25 is the compact and is the EXACT same size as the G19(9mm) / G23(.40) / G32(.457) and the G39(.45GAP)
Like the G39, the G38 has a thicker slide, but all share the same frame, including the G25.
So, more expensive ammo, less effective caliber, and very large in size for a .380, coupled with the difficulty of getting one in the country, leads to very very few available.
Also, the G25 and G28 are blowback operated, so felt recoil is going to be about as bad as the 9mm anyway.
Hope this helps.