Enriched Stitch's portrait of a house in Nantucket was a retreat class at the shop several years ago. The canvas is no longer an exclusive to the shop but the stitch guide Suzie wrote is available from them. You can see two versions of "Summer at the Shore" here and follow the link to purchase the downloadable PDF version of the stitch guide.
The shop can also probably furnish the threads needed and the canvas. Just ask nicely.