eBay
Companies that make custom car stickers include: CarStickers, Decal Driveway, Cafe Press, Decal Girl, Decal Junky, EDecals and VistaPrint. All of these have online websites.
Customized boat stickers can be purchased from a variety of places. The boat stickers can be purchased form Pottery Barn, Decal City, and Name My Boat.
Bumper stickers can be made at your local sign and decal shop. Large volume orders would probably best be served by a business that specialises in them
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Car decal stickers can be found at sites such as Car Stickers, Decal Junky, Visual Tuning and mainstream retailers such as Amazon. Another place where they can be found at competitive prices includes eBay and Vista Print, where one can be custom designed by yourself.
If you would like to buy vinyl decal stickers of car logos, a good place to start would be an auto store. You might also have luck at a dealership. Of course, searching online would give you many options.
To take stickers off of a bike you peel them off. Sometimes stickers are covered with clearcoat, in which case they can't be removed unless you sand them off and repaint the bike. In which case you're better off covering them over with a single-colour vinyl decal or something.
You can try peeling them off or get a cotton ball with nail polish remover and scratch at them with the cotton ball.
you can buy stickers at the store example: target
Decals normally go on the body of the car and stickers or for the windows. hope that helps.
Yes there are many websites that can help design custom window stickers for your party. Check out Vinyl Disorder, Banner Buzz, Sticky Life, and Decal City. All offer the service you are looking for.