It seems to me like certain corys are overbred in different countries. Do you know what your PAH corys are? My local PAH has peppered, bronze and albino. Seems to me that the false juliis have an over breeding problem in the UK.
I haven't been inside a Pets at Home in well over a year, but I hazily remember seeing C. paleatus (peppered), C. panda, and C. aeneus (bronze), both the normal colours and the albino and black morphs. They might have had trilineatus as well. Can't remember. I got my trilineatus, pygmaeus, and habrosus from our local Maidenhead Aquatics. The others all came from a nerdy independant LFS.