A fun store
This is a great place to do some browsing on a rainy day, when the weather just won't let you get out on the water.
The variety of things is matched by the variety of quality, and you can find quite good antiques chock a block next to picturesque junk, but that's what makes it fun.
While you are there, take the time to walk, not drive through downtown ellsworth...there is a riverwalk behind the lovely library, and lots of nice window shopping.