Sadly, there aren't any LSS left in Southern Maine. The closest one is in Hampton, NH. It's called Wholly Scrap and it's right on Rt.1, about 1/2 hr from Wells. It's not very big but it does carry things the chain stores don't.
In the next town south of Somersworth, there is also a stamp shop that also carries lots of scrapbook paper and some other paper art supplies besides lots of stamps, inks, etc in Dover NH called Stamped Designs. You will not be sorry you stopped in here, her shop is loaded with goodies and on going sales.
Check their linked websites for their hours.
Near where you will be, south -- On Rt 1 (main route) near the York/Kittery town line called Maine-ly Stamps. It is a small shop, if you are heading south on RT 1, it would be on the left side in a small plaza. There is no website.
Hope you have a great time.
The weather will be pleasant for you.