Sheboygan, Wis. (WHBL) - Another Sheboygan drug dealer will be out of circulation for a while.  43 year old Marvin Blackshear had been arrested last March after selling crack cocaine to an undercover officer on at least three occasions in the city of Sheboygan.  Blackshear was in Sheboygan County Court recently when Judge L. Edward Stengel sentenced him to 2 and a half years in prison to be followed by 4 and a half years on extended supervision.