I have used the biogold and it worked well but was expensive. i have found that meangreen is more economical, but you have to mix it your self.I had placed a order for the ready made cakes and liked the results. so i purchased a 2.5 pound bag of the summer mix and mixed it myself. its not hard. I recommend using a small size ice cream scoop, it will dry alot faster this way.
I just ordered 2 five pound bags of the stuff, they are offering free shipping for the month of march. good deal. You have to call because they have not updated the free shipping on the website. karen is a nice person to deal with.
www.Meangreenfertilizer.com
www.dallasbonsai.com sells the biogold and rapeseed
www.hollowcreekbonsai.com also sells cakes
i have purchased some cakes from ebay also, but i think meangreen is going to be my main source from now on.