For those Logan airport experts, I'd appreciate any input! I've looked into this a bit but have come up short.

I have a Saturday 6:30am flight out of Logan. I was wondering if there are cheaper options to get to BOS from Harvard Square than a taxi (seems like it'll run $40+).

The only shared van shuttle service I found doesn't run between 2am and 6am. And the T starts running around 5:15am, which would put me in to Logan around 6am, I'd imagine. Is that cutting it too close for a Saturday morning? (I would not have checked luggage and would check in online, obviously.)

Thanks!