Print them on photo paper, then attach with the clear contact paper. I finally found a use for a gizmo DW bought for scrapbooking that cuts everything out in a perfect circle!
You can also download the image and take it to a vinyl shop for conversion to a decal (magnet or adhesive). Kinkos also does this, but I do not know the cost.
I got mine that time that they mailed them out, but I doubt that will ever happen again.
You can reproduce the image for your own personal use, but you cannot sell them without permission from RV.net.