The various Mandarake shops sometimes put up really cool displays in their front windows. Sometimes the toys have price tags, so I guess they're for sale. Other times it's just a bunch of toys up on display. Of course, over the years sofubi collectors have drooled over the Not For Sale indy sofubi displays at the Shibuya and Nakano branches.
Here's the newest window display, which I thought was pretty cool: Playmobil.