FYI -- rental car prices have been dropping so you might want to check those as an alternative. We're flying in to SFB on 6/18 and have an Intermediate car thru Hertz at a weekly rate of $122. Dollar has $119 but they don't allow you to drop-off a car after-hours like Hertz does (we have a 6:45 a.m. return flight and the rental counters don't open until 8:00 a.m.)
Of course, rental car prices vary by date but they often come down as your date approaches. I originally had a weekly rate of $179 thru Dollar, then I rebooked at $163, then just within the past 2 weeks Hertz suddenly offered a $138 rate, then Dollar dropped to $119, then Hertz dropped to $122. It pays to keep checking (and there's no charge to reserve a car and then change/cancel as often as you like).