infusoria is the easiest stuff to create.. just get some trough water, and add it to a clear glass container with great lighting, then add some liquid fert (organic.. so non toxic) or make your own, then just wait a few days for it to boom (booms faster in less than 2 litres.. i used coke bottles)
Danni Mokomoko (search him up on Facebook https://www.facebook.com/thebearded.maori?fref=ts )
He is a leopard gecko breeder in wellington (i believe he will ship)
... very high quality leopard geckos, all his animals are healthy, and reasonably priced... I highly recommend searching him up
From my understanding, Bladderwort is an unwanted organism, making it illegal to sell, spread, or knowingly keep (although if you "dont know" its in a pond you may get away with it)
..
Source: http://www.biosecurity.govt.nz/pests/bladderwort
There are no crested geckos in New Zealand
Leopard geckos on the other hand are available around the country... I know Danni mokomoko in wellington sells them and is willing to ship