"working" off board almost never makes sense. DO the math.
My friend, worked off part of her board. She spent 8 hours on saturday, and 2 hours twice a week, add drive time and you are at 15 hours. Even with a crappy job that's over $400 a month in labor/ your time to work of half of a 300 dollar board fee. Dosnt really make sense .
If you are working retail at $7 and hour you are way better off just adding a few hours a week to your schedule. Or looking for something that will give you more hours a week.