Along Omotesando-dori lies Kiddy Land. A building full of various toys for all ages. With the top floor holding mainly action figures, 12 inch figures and other stuff.
Jan 2010 UPDATE: Updates in Blue. Check the pics out below!
The shelfs in Kiddy Land are kept pretty up to date. You’ll find current stuff here.
Along Cat Street is a small shop called AstroMike. Selling some vintage 80s & 90s toys as well as current toys. Pretty good to find some rare and old stuff.
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Nearby Harajuku is Shibuya and Mandarake can be found there. Refer to the map below. From the pic of the entrance above, the stairs lead down to B2 where you will find the shop. It’s a pretty huge underground space with lots of anime dvds, manga and toys. Though the toy selection may not be as big as other places, I have found some hard-to-find stuff there in my past two trips. Good for Transformers, Macross, Gundam, small range of 12 inch figures and Otaku stuff.
I’ve added some pics of how it looks down there. Pretty cool underground toy shop. 
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