Arizona Republic:  “He advertises himself as a medical-marijuana patient offering extra high-grade pot ‘with huge buds’ for a ‘reasonable donation.’  The seller’s Craigslist ad says those with medical-marijuana cards can purchase an ounce of high-quality pot — and get it delivered — for $250, about $150 less than what some medical marijuana dispensaries charge, he told The Arizona Republic.  . . . While Arizona’s medical-marijuana program is intended to be “purely medicinal,” some participants are exploiting the law by reselling marijuana they’ve legally purchased or grown, fueling the illegal drug market.