[Firebird]

Hey guys,
after my last question was answered quickly and efficent i decided to ask for help again.
This time i will be in Osaka from tomorrow for 2 days and i need to buy camping gear or lets say it like this: Im gonna rent a car and want to sleep in the car so i will need a sleeping bag or a blanket and some kind of a mat to sleep on.
Because im taking a cheap car i will not have a navigation so i will need a road atlas for Chugoku and Shikoku, any recommodations? Best would be if it showes the michi no eki as well.
Now my question: Where in the Osaka area can i buy this stuff? Anywhere next to a train/Bus/subway station will do! (just cheap if possible, second hand would do as well)
Cheers again guys, hope you know something!