Custom stickers, decals, iron on pics, where can i go to find a place to do this?

Okay so the deal is a friend and I are wanting to advertise using custom stickers, wall/window decals, and iron on clothing patches to help spread the word cheaply and possibly sell these items at a later time. Trouble is, all the sites I have found do round, oval, square, or banner stickers/decals. What we want is for these items to be cut in the shapes of the images since they are the product its self. (IE a snake shaped sticker in the shape of a snake, not a snake on a banner or a circle) So, does anyone know of any online stores that do this type of work or any shops located in the MO/IA/NE corner that does this, for a reasonable cost? Of course a site or shop that does decals, stickers and either silk-screening or iron ons would be great also! thanks in advance for every ones help!!