Most of the Home Depots I've been in have a pretty decent "Garden Dept.". They should carry a variety of organic, soil, fertilizers there. For example: "Kellogg" organic, all-purpose, fertilizer (4-4-4) - it's made from dried poultry manure, bone meal, feather meal, kelp meal and alfalfa meal. Plus, it has a whole list of Mycorrhizae and other beneficial microbes. You can add a "balanced" fertilizer like this, mixed at a moderate strength (maybe even a little on the "light-side") right in with your potting soil at every re-potting throughout the entire grow. This will give you a "soft-dose" of basic nutrients that are good for all stages of growth.
Now, bring on the Alaska Fish Fertilizer! But remember, it comes in two flavors: "Regular" Alaska Fish Fertilizer (5-1-1, in the "Yellow Label"), and the other one is "Morbloom" Alaska Fish Fertilizer (0-10-10, in the "Pink Label").
For the veg stage, use the "Yellow Label" at about 1/2 strength to spike up the Nitrogen.
For the flowering stage, use the "Pink Label" at about 1/2 strength to spike up the Phosphorous.
Using just these 3 products available at Home Depot, should be all you need! Oh yeah, about MG products - don't get me started!