This is an incredible perennial nursery located in Carlisle, MA. They claim 100,000 varieties (I never actually counted but I could believe it) all lined up in neat rows. Everything is catalogued by row number and location so if you are looking for something specific it's very easy to find.

There isn't any mail order but their website is excellent and has both a print catalog and a photo gallery of most of their plants. The owner is a walking encylopedia of plant knowledge.

My commute to work takes me within a mile of Blanchette's (poor, poor, me!!)

Here is a link that might be useful: Blanchette Gardens