I got a nametag for my dog years ago at a small place in the Woburn Mall, off the highway 38 exit of 128. The place was close-ish to the McDonalds, across from where the Fabric Place used to be. I tried looking online for them, but found this place instead which might work for you as well (it's apparently in a mall, so you can go over the weekend):

http://www.pictureframing4less.com/name-plate-engraving-services.html