If there's one store I can recommend in Ann Arbor, it's Gro Blue.

It's perfect for the hobby grower or new medical grower. The shop sells in quantities suited towards the individual grower or possibly the dorm room grower.

They sell small hydroponic systems and starter sizes of many different nutrients, amendments and supplies.

The staff is highly knowledgable.

I purchased earth worm castings, air stones, food grade PH down and a variety of other small products, all for under $20. I paid an average of $4 per product.

It's a great place, Gro Blue!

Located on E. Liberty in downtown Ann Arbor, near the U of M campus.