If in the UK and nearer the North then Pier Aquatics in Wigan is the place to look, but as it's a shop it tends to be as and when Neil has them in. Generally has a goonch in as gets 10 a time around 6" and not many want to keep them. As for the Jau, he gets again around 6 - 8 but at 2" and these are much rarer to find. Although you can also ask for him to " find you one" and he generally will, but it will cost more and often will be larger. Neil also imports and has teams of fish locals around the world so hence being able to source. That and many years in the business.