AFAIK it's no longer imported by any suppliers possibly because of problems associated with a single pack powder having insoluble calcium salts build up over time.
I still have a 1 year old open pack of maxibloom and it looks fine but there's a teaspoon of completely insoluble white precipitate every time I mixed it up...
Whatever the reason, you won't find many single package complete nutrients. Bunnings have manutec hydroponic two pack pretty cheaply that I'm about to start some seedlings on.
For flowering particularly with easily tip-burned nitrogen sensitive sativas, you will want to have much less calcium nitrate (soluble nitrogen) and more potassium - they have a low nitrogen liquid potassium supplement that might serve - that's what I'll be trying when it comes to flowering.
many thanks for this info. I know what you mean about the insoluble calcium. i have found that mixing with warm water greatly reduces that precipitate, till basically there isn't any. its just extra work, have to mix in a separate rez with warm water, fully dissolve, let cool, then xfer to main rez.
i have the manutec one and i have used it for veg before but its not ideal for flower. i could add liquid potash to it i suppose, if i wanted to use it for flower.
i did find another powder one called ozi magi or ozi tonic monsta bloom, but its even more dear than the oveepriced maxi bloom on ebay! Also i think that is two part.
So i guess i just have to pay more for maxi bloom on ebay if i want to continue using it, or switch to something else.