A Great Store I've Never Been To
The Construction Site has got to be one of the coolest toy stores I've ever come across. I have no affiliation with them, I've never ordered from them, and I've never even seen the store. But I'm planning to now!
The store carries only construction toys, most but not all of which are available through their website. They have many of the great toys that I played with as a child, as well as several toys that I'd like to play with now! I love all the marble runs, and there are some truly great products that I didn't even know were out there.
I discovered the store via a comment in a recnet MetaFilter discussion.