There are many online clipart services that provide excellent clipart for rubber stamping; the best images are from services that are subscription based that charge a yearly or per image fee. If this does not suit and you really want to save money you should find out which service your rubber stamp manufacturer belongs to, it costs nothing to search through the clipart service that he belongs to as he will be the person downloading the images. This bit of lateral thinking and finding the right manufacturer will save you lots of money because you will never have to pay for the clipart. Clipart.com is one of the best services that some manufacturers subscribe to; I estimate that over 3 million images at Clipart.com are suitable for stamp production and they are fine with manufacturers using the images for rubber stamps.
Computer programs work with image data in a number of different ways, for example programs like CorelDraw work with both Vector images (lines) and Bitmap images (pixels), CorelDraw is also the preferred program for making rubber stamps from images.
Once you've found your desired category or search results page, navigate through the thumbnails by using the arrows at the top right or bottom right of the section (bracketing the word "Next"). You can preview a larger version of these thumbnails by clicking on their respective magnifying glass. If you find an image or media you like, check its corresponding check box to select it. You can select as many as you like.