Amazon has tons to choose from, check them out, i always get the organics ones :-),
Brands, worthy of mentioning: Fox Farms Trio, General hydroponics Flora Series, Advance nutrients, all are excellent products
Recently harvested Greenhouse Seed's Super Lemon Haze She is potent, you should add her to your list of strains :-)
P.S., here she is in her 5th week of vegetative growth
Two hybrid clones, from seeds to harvest (Bubblegum crossed with my local Sativa), called, "Thaigum". She sure tasted SWEET and potent as Hell! This is OUTDOOR!
if you can afford purchasing a product called Alaska Fish Fertilizer, that will definitely put a SMILE on your face :-)
As for your grow medium, you can either get Fox Farms Ocean Forest, Black Gold or even your own native soil, provided that it's sterile before use. Frequency for my nutes are...
I have a simple feeding regiment that YIELDS Killer Buds and i also grow 'em outdoors. I also live in an island, pretty much the same weather pattern and temperature, much like your island :-)
I harvest mostly Indica's & some of my local strains in a two month span and i keep adding more...
one theory could've happened, they might have taken your seeds and not officially report it. I can back this up, because two of cousins are working for the feds (cbp). P.S., you are not screwed, just lost your canna seeds that's all!