I use Avery labels number L7161 to print the labels and stick on the back of the card. I put a picture of the pen, a description of the wood, what refill and its number. The downloadable (free) from Avery acts as a database for all the pens I've made so that I can always identify a pen if someone contacts me about it. I stick this on the back of a business card and then a price using Avery labels number L4730REV.
I then use a small craft label that I got from Ebay to put on the pen with its number on one side using the L4730REV labels and a price on the other side with the same labels. This might seem a lot of work but its well worth it in my mind and I've got very fast at doing it. I keep a spreadsheet of the prices.
