Find some Avery round stickers of the right size at Office Depot or where ever. Then search Avery.com for the catalog number and get the template I found
these but the webiste was acting up so I couldn't find the exact type I used, but they were like this. Anyways, they have templates that allow you to design your label then just throw the sheets in your printer.
Here is an example of what I made, you can just barely see the edge of the sticker.