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Glowing mushrooms are very easy to find in falmer infested caves and dungeons, i.e. shimmermist cave, but I've NEVER EVER EVER seen them appear in the inventory of any alchemy shop.
Let me make it easy for you. The ingredents required to make a blacksmithing potion are Blisterwort, glowing mushroom, spriggan sap, and sabre cat tooth. A combination of any two of those ingredients is what is required. As far as finding recipies, I don't know how rich your character is, but if you buy Honeyside in riften, and purchase the alchemy lab upgrade, you will always find several random recipies in the alchemy lab.