Tokyo - Plarail what and where to buy?

There's a Plarail and Tomica Store inside Tokyo Station in an area full of themed stores on other licensed characters. It's small but has loads of stock and I'm pretty sure it has exclusives. I think somewhere else in the same station, you can find an isle of Gachapon Capsule machines carrying loads of different themes, including a few Capsule Plarail toys.

Otherwise, there are plenty of department stores and some multi-level toy stores around the city which will mostly carry the same things.