Ebay Link For Soil Admendments

Hi I want make my own super soil and I don't really want buy a ton of different bags and boxes since I am only growing 4 plants under a 400 watt so here is the link I am looking at for sum soil amendments I just want to check what u all think before I buy or even if I should buy at all:

http://www.ebay.com/itm/Organic-Soil-Amendment-Mix-kelp-meal-bat-guano-alfalfa-neem-meal-crab-shell-/121353223836?pt=Fertilizer_Soil_Amendments&hash=item1c41373e9c

US $29.99 free shipping (Worth it or not?)

1 Cup Kelp Meal
1 Cup Alfalfa Meal
1 Cup Fish Meal
1 Cup Neem Meal
1 Cup Fish Bone Meal
1 Cup Crab Shell Meal
1 Cup Glacial Rock Dust
1 Cup Bat Guano
1 Cup Oyster Shell Flour
1/2 Cup Gypsum

It,s not a bargain. You can buy pre-bagged supersoil now if you only need enough for 4 plants. And it is already cooked ready to use.