Yesterday:
Grand Forks 1.99
Mayville 1.89
Cooperstown 1.84
No pipelines to Mayville or Cooperstown, although both are closer to the Fargo to Minot route. Not sure where the places to load trucks are along that route.
GF has been known to keep prices higher - that dates back to the 70s at least. Controlled mostly by one GF station owner. In the early 70s, however, a gas price war kept prices at 0.19 for an entire school year in GF.