Although this seems to be a 'hydroponics' store (as far as products they carry and the culture/attitude of the place-a bit different of a feel from the 'upscale', or 'mom-and-pop' type garden centers), it has a number of organic fertilizers and amendments (liquid and solid), seed starting mixes and organic soil mixes and other seed starting supplies useful for the outdoor organic gardener that likes to start their own transplants. They moved to a bigger location up the block last year and I haven't had a chance to fully explore the new store. They seem to carry a large selection of lights, etc for indoor growing but I am not in the market for those.
It is in a somewhat obscure location in what seems like a light industrial/manufacturing area but worth the trip over there every spring to get what I need (it's also across the road from Farm and Fleet if you need any materials/supplies from there).