If traveling around the US has taught me one thing, it’s that Maine gets some of the best beer distribution you could ever ask for. Seekabrew has a good, albeit incomplete list of all the breweries you might find on the shelves. Hover over the name for hours if you’re not on mobile.

Bier Cellar299 Forest Avenue
Portland, ME 04101
Best shop in the Portland area, sign up for their email list and get details on upcoming releases that you can reserve, pay for and then pick up later
RSVP887 Forest Avenue
Portland, ME 04101
Largest collection but service can sometimes be on the not so good side
Maine Beer and Beverage28 Monument Way
Portland, ME 04101
Located in the Portland Public Market, no on-site consumption but there are a bunch of great lunch options here.
Old Port Spirits and Cigars[/a>79 Commercial Street
Portland, ME 04101
Located directly across from the ferry terminal, so parking and foot traffic can be a nightmare. That said, some more limited pricier bottles last longer here since craft beer drinkers are not their primary clientele.
Craft Beer Cellar111 Commercial Street
Portland, ME 04101
Located right on the waterfront, parking and dealing with the influx of tourists in the summer/fall can be a chore but they have a great, albeit pricier, selection
Tully's45 Wells Plaza
Wells, ME 04090
Largest beer/wine collection in York county
7-11 in Kittery169 State Road
Kittery, ME 03904
Convenient location just as you cross the ME/NH border. Impressive craft beer selection for a 7/11