Buying suitcases in Tokyo

Hi everyone,
Wondered if you can help me
Will be travelling round Japan with a backpack so don't want to lug a suitcase around but was thinking of buying a large suitcase during my last few days in Tokyo
Anyone has any idea where I can get one for quite a cheap price?
Thanks so much!

Sandy,

I would check out Bic Camera (only larger stores have suitcases) or Don Quijote stores.

Don Quijote Tokyo store list:
http://www.donki.com/search/shop_list_en.php?pref=13
Bic Camera main store list:
http://www.biccamera.co.jp/shoplist/index_english.html

Tokyu Hands will have a lot of more stylish higher-end suitcases, but not so cheap.

And if you want really cheap, I recall there were several smaller shops in the area around Ueno station that sell low-cost luggage.

Red John suggested where I would also- Ameyoko has heaps of cheaper luggage shops- right near JR Ueno station.