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I paid $49.00 for 45 x 30 mg Adderall IR at the pharmacy last month. That is the full price because my insurance is transitioning right now. So perhaps that can give you an idea of where to start. So it seems like $1.00 per pill.
However, that being said, on the street, prices can be ten times or more what the things are actually worth. But I don't know if that is against the rules or not to talk about such things (I don't think it is permitted), so I won't give any estimates to street value. But I think that giving the legitimate price is fine.