Jarred- For many years I had a sign and silk-screen business. I got rid of my big electric press, but I still have some hand operated screens. We could certainly produce some stickers, especially if we could tweak the design a little, and cut down on the number of colors. When I had the business, we did mostly real estate, traffic, and political signs. Here is an old picture that I found:
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The ones in the picture are 2 x 3 feet, and use 3 colors. The red letters have ¼ black borders. At one point, some customers asked for stickers, to put over the, "FOR SALE" section, like, "SOLD", or, "FOR RENT", etc. I found a place that had sheets of pressure sensitive vinyl, and they would score the peel-off backing, wherever I wanted it. One time, when I went there to pick up stock, they asked me if I could do stickers for gas pumps, for Sinclair Oil Co. (I think now defunct, or taken over) I ended up making several thousands of those, with their little dinosaur logo.
Now it depends on what size these stickers we are talking about. If they are six inches, or more, long they would probably best be done silk-screen, on vinyl. However, if they are only an inch or two, they could probably be done on polyester (aka mylar) with a color laser printer.