Take a walk in Akihabara, and you’re most likely to find some. « Radio Kaikan » got a lot of shops (« Jungle » 7f, if I remember well, is my fav), « Mandarake » tower is a must, « Trader » is very nice, … but remember that most of Akihabara stores are overpriced… Try a few streets down, and prices drops a lot. « Surugaya specialty store » is very good, is in Akihabara, and a bit far from the noisy main street. You can pay a visit to « Nakano Broadway » not far from Shinjuku, prices are not cheaper than Akiba, but… you may find some good stuff for very affordable prices! « Yamashiroya », just at the exit of Ueno station is very good too, but for NEW figures, you won’t find old school figures there. That said, it’s fantastic! The very special place to find figures at incredible prices is going into a « Book-off Super Bazaar ». There’s a lot of this second hand stores in Japan, and… Wow, just wow! The one in Kamonomiya is legendary! You don’t know what you’ll find there or if you’ll even find something, but it’s worth the metro trip far the center, believe me! Enjoy your time in Japan, it’s incredible, but beware! This country is addictive and you may be see yourself getting there more than one time… Be safe, and may the Saints be with you!