Imazo is a wholesaler located in Sweden. A local fishshop here in Stockholm has a regularly
updated list where you can see available fish.
The owner of Imazo or responsable person for the fishdepartment(don´t know) is mentioned from time to time in the Amazonas magazine. He seems to be a friend of H.G.Evers.
I don´t know if they deliver outside of Sweden. They have more or less the whole time
Parosphromenus on their list.
If you check the norwegian labyrinthfish forum, there is a regularly updated importlist from
a shop in Oslo. The doing imports from Singapore. At the moment they have also P. opallios listed under the name “Giant Red Sparkling Licorice Gourami”.
Under the same name P.opallios are offered sometimes on Aquab** by a company in the US,
located in Portland,Oregon.
So it looks like the source is somewhere in Singapore.