Welcome to the project!
Ruinemans occasionally has P. ornaticauda. Previously they used to import other forms as well, but since most species are hard to keep good in such conditions they stopped doing this. Only P. ornaticauda seems to do well.
If you want P. deissneri you better buy a ticket to Bangka, an island off Sumatra. This is the only known place you can get them. There is only one pair we know of, which seems hard to breed.
Utaka in Amersfoort has a bintan-variant at the moment. In this topic I put some pics of them.
P. sp. “blue line” isn’t exactly a species. It is just a name traders give their paros with blue fins, regardless of species. Fish bought as “blue line” mostly are bintan-variants. The bintan-complex consists of a few forms of which taxonomical status isn’t clear yet. Since most of them are rare in the hobby you could consider getting some if you can. You never know which variant you get, though.
But why do you want Parosphromenus?