The supply of iPhone 3G and iPhone 3GS units is running low in Canada’s Rogers Wireless and Fido stores, according to a new report. The Globe and Mail reports that Apple is shipping only limited supplies to Rogers, which claims to be out of both models. “We are out of stock and still taking orders as our inventory continues to come in week to week,” Rogers spokeswoman Liz Hamilton said. “While we have continuous incoming inventory, we…