If you are unfamiliar with buying unmounted rubber stamps, here is what you need to know.
You can use acrylic mounting blocks as a temporary and reuseable way of mounting your stamps. You will need the static cling mounting foam for the back of your trimmed unmounted stamp. The static cling mounting foam is sticky on both sides. Simply trim it to the size of your stamp, stick one side onto the stamp, and when you are ready to use it stick it to an acrylic block that it will fit on. When you are done, you peel the stamp with the foam off of the block and stick it on a plastic storing sheet until you use it again.
View complete instructions here.