I don't think many of the department stores will accept traveller's cheques - it's not a common practice outside North America, is it?
As for places that will change traveller's cheques - you might get lucky and find an exchange office in Shinjuku Station... but that's just an idea, don't take my word for it.
If it wasn't Sunday, you could try the Amex office...
The address for the American Express agent is:
Nippon Travel Agency Co. Ltd
Tokyo, Japan 104-0031
(though it looks like it's only open Monday to Friday)
I think, on balance, you're much better off using a cash machine.
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Could you please tell me which department stores in Tokyo
will change/ accept travellers? Do you know of any places other than banks
and post offices that will change travellers cheques?I have run out of
cash and it is sunday! Cheers!