There's a few people which actually manage to breed this fish in the market. However, whether they can produce it every month is questionable. Furthermore, most of them won't share most of the information to stranger.

Prof. Seno is one of the guy that actually successfully breed and rear soon hock till juvenile and capable to repeat it again and again. His survival rate on breeding and rearing the fish is about 5%-10% (data he gave in 2009). The thing with him is, he is an educationists. They published their result in International journal  and have proper hatchery and nursery for Marble Goby research. Thus, more reliable. Even if they want to bullshit anyone...there's will be some implication on their status.