I can't recommend a specific place, but just wanted to add my experience. When we put in a 15 X 30 raised vegetable garden at our old place, I purchased a "garden mix" from a local supplier. They told me the proportions of compost and manure and soil and sand and I was happy with it. It even "looked" nice and rich upon delivery.

However, in all honesty, it took me almost a full year before my vegetable garden looked good. My vegetables looked really yellow and not very thrifty. I had my soil tested and things weren't too bad, A&M just recommended some supplemental nitrogen. But, in retrospect, the best theory anyone gave me was that the compost used in my mix was a "green compost" and not fully decomposed such that the organisms decomposing the compost were using the nitrogen my vegetables needed.

So, just beware, your first couple of crops of vegetables may not seem worth it, but be patient keep amending your soil with organic matter and fertilizer (be it organic or Miracle grow types) and eventually you'll have the garden you dream of!