Machimori Cafe, near Setagaya Station on the Setagaya Line has cakes in small boxes shaped and decorated like the various Setagaya Line trams. They also have a small calendar with ink drawings of the present and former trams used on the Setagaya Line. They also have the Tokyu DVD on the Setagaya line. The square cans with the trams on them have hard candy inside. There are a number of photos on the wall in the cafe. As far as I know, there are no other shops with goods for the Setagaya Line, and no hobby shop along the line with train models, but would be happy to be proven wrong.
Leaving the platform, walk towards the lane that cuts the tracks and turn left towards the large busy street. It's the Setagaya Dori. The cafe is on the right side. The temple is on the left side.
Best wishes,
Grant
