By Risa Polansky When Miami Mayor Tomás Regalado set out to clinch a lower cost for parking at the new Marlins ballpark, he thought he'd have to start over to do it. Just last month, city officials were considering scratching a nearly six-month bidding process to begin again in hopes of scoring a smaller price tag for the planned four-garage, six-lot project. But in a late-innings play change, commissioners last week agreed instead to go with Suffolk Construction, the original bid favorite — which says the job can be done for a maximum $75 million. That's $19 million less than the $94 million parking cost city officials have long cited. And rather than bonding $120 million to finance it, as commissioners grudgingly agreed to do last year, the city will only have to sell about...