I am KSBY based . And yes it would be cheaper than KLGA i also know that the reserve FO's in Ksby fly quite alot because we go both north and south out of there. I drive 3hours to KSBY. But it is not a bad base i also know of one other FO that commutes to NH.
Take it easy . If you reply it will be next week before i get back to you i have 2 two day trips and an out'n'back . But like i said before best of luck in the interview.