Hmm I should of given you some websites so here we go.
Yodobashi store pentax camera link:
????.com - ??????? | ???????????????????????
Map camera link:
https://www.mapcamera.com/digital_camera
As I mentioned previously if you have the chance get a long to Yodobashi store.
Of all the stores I would recommend you visit to store located at Akihabara in Tokyo. The Shinjuku branch is also good but nowhere near as big and it is spread across several different buildings.
This is a massive flag ship store and the amount of electronic gear they have on display for you to look at is rather stagering really, I like to just go there and do nothing but browse.
I am not sure if you have been to Japan or Tokyo specificly before but the Akihabara store is very close to the Japan Rail Akihabara train station, and the line that it is on is also one of the major ones so it is easy tog get to and find.
As for the Map camera store the second hand store I went to is in the Shinjuku area of Tokyo (major area with practically everything here). Within walking distance of the Japan Rail Shinjuku station but can be rather hard to find as it is in a maze of streets full of stores and food places. Also the only indication it was there was that there was a sign on the street saying "map camera" you then had to go into a small entrance area and catch a lift up to the appropriate level. Also the two different stores are within a block or two of each other.
Cheers