from the web, it seems that Map Camera is on west entrance of shinjuku station...correct me if I am wrong.
yes, west exit of JR station
Do u have any photo on the front of shop?...u know lah....all japanese signboard: Map Camera
photo of shop front on their web
http://www.mapcamera.com/shp/s1.html
Hear that if we pay in cash (with passport shown), we are able to get instant 5% discount/tax rebate....is this true
yes, but they give tax rebate even with CC.