Google. Amitrite? I did a general search for “Romney Ryan bumper Stickers” and got back three paid ads, one reasonable search result and a bunch of bullshit.
So I tried again with more information to help google understand what I was thinking.
Try Refining Your Search By Adding More Words
Cripes Suzette 
You don’t seem very trite, but you are right.
I wonder if any of those who slavishly shill for Obama will ever realize they’re figuratively carrying the handbasket America’s going to Hell in?
I’m giggling like a madman at your refined search inquiry.
If you ever find that particular bumper sticker please let me know where I can get one too.
The pulled this with the movie 2016 Obama’s America as well. Google came up with no results, and Yahoo had bad links to theater showtimes. No bias there. Nope.
BTW, you can find the bumper stickers at mittromney.com 😉
At least you got a better choice when you clarified your inquiry.
“political bumper stickers romney/ryan” will take you where you want to go.
And of course, to a lot of places you wouldn’t dream of going.
I have my minions searching even as we speak…