Concentrate Strains

I just got my first vaporizer (I was saving to buy one but a friend of mine just gave me his since he's upgrading). He gave me a bit of concentrate to get me started in an unmarked mini-canister. This might be a dumb question but can you get strain-specific concentrates at most dispensaries? Or do concentrates not rely on strain like flower does?
 
CharonBucephalus,
Awesome - sorry for the silly question! Friends have always shared their concentrates with me so I've never known.
 
CharonBucephalus,
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