I have a quart jug of Alaska kelp liquid that I got from Home Depot.
There is also some in my Go Box, and my lobster compost has some.
Btw, I love that compost, and have been using it in the garden for years.
[video=youtube;CQyK8EVn3Mc]http://www.youtube.com/watch?v=CQyK8EVn3Mc[/video]
Edit: just to be clear, I don't think it's worth the Amazon price,
which is about twice what it costs locally. But if you can get it,
it's worth trying. First time my wife bought it, and I chewed her
out for spending so much. I had to eat my words later. It's great stuff.
I have never seen anything else (and I am a bona fide fertiliser nut)
get my tomato leaves so green. It also seems to help with the taste, IMHO.