Where can we get bumper stickers and yard signs?
If you're asking regarding, say, such things supporting a political candidate, then call their headquarters and request them.
I've never seen bumper stickers, but hardware stores sell yard signs.
I hav an auto shop near me dat sells bumper stickers
I seen signs at walmart
If you want them personalize then go to vistaprint.com
go on ebay or maby Spencer's
Since this is in politics, I'd recommend checking the candidates' website. You may have to make a donation and/or pay shipping. If you're looking for Obama, you can check democrats.org.