In World 2-1, behind a bush (it's the area before the pyramid) is a place with a ? block, and it has a big 1-up sticker.
The Big Shiny 1-up sticker is in Rumble volcano. When you're in the area with all of the logs, go to the right side and hit the farthest log with your hammer. The big shiny 1-up will fall.
Those are the only ways to get 1-up stickers.
No multiplayer
No. It's for the 3DS.
you cant, but the sticker he sells its not worth it (its a poison mushroom)
The faucet.
in the mansion
Paper Mario Sticker Star's date is Christmas 2012
November 11 2012
password super mario3
Paper Mario sticker star is a Nintendo DS game that can be purchased at your local GameStop store. Also you should be able to find this game at your local Walmart, Office Max or Target stores.
e-shop (it costs less)
Jump on the faucet a few times.
After you beat certain enemies or finding it in random places.