From Doug Peck's Port Lines Home page....
"9/22/2013--- We are forced to DISCONTINUE our extensive line of rubber stamps for use in AF restorations. Our stamp manufacturer closed their doors and sold all their equipment without notice. Unfortunately, apparently along with it went all our artwork! We have been unable to track it down, and the cost of stamp manufacture with other sources we have checked is much higher. So we will continue to market existing inventory while it lasts, but there will be nothing new made, and no re-stock as we deplete inventory."
Note that was over a year ago. However now I visited the section for Rubber Stamps and they are offering the service at their shop, $15 total ($7.50/side). Just send a cleaned up, painted, ready for stamping shell. They also have a lot of stamps still in stock and there is an AF Clinic added pertaining to lettering options, including stamping items. So maybe the rubber stamps aren't quite a dead issue just yet...?