Do you know a secondhand cellphone store?

I am currently looking for a GT-I9506 and I am really hoping that i could find a used phone that's in good condition in Japan. If i could find the phone, will it be compatible with the sim cards from other countries? GT-I9500, GT-I9502, GT-I9505 and GT-I9506 are Samsung Galaxy S4 models, i'd be very very thankful if there'd be any of these models in a second-hand cellphone store in Japan, BUT GT-I9506 would be better.

If i could find the phone, will it be compatible with the sim cards from other countries?

Yes, but only if it has been unlocked. Also, it may only operate on 3g depending on the country you plan to use it in.

How much would it possibly cost?
Thank you for answering my question! :)

Not sure on the exact model but looks like used Samsung Galaxy S4s cost around 35000-40000 yen:

http://kakaku.com/item/K0000510250/used/?lid=used_keitai_useditemview_...

Thanks a lot :) but i guess that already includes the shipping and taxes. :) Thanks! Thanks! Thanks! now, I'm gonna look for that phone. The only turn-off is the "Docomo" in the upper screen. Thank you again! :)

or checkout this online site where you can get new or 2nd hand phone.
http://www.musbi.net/sys/c/116107101143101.html

Thanks! is that the only available version of s4 in Japan? is there no s4 without the Docomo logo?