If you happen to be in Florida now, you might want to get ahold of Pete Omen. His cue work is awsome (one cue I would love to own) and lists retaper at $20 and up.
http://www.omencues.com/
Woody
Thanks Dawg. Johnnyt
After removing the tip you can measure the wall thickness of the ferule.And, how does that process work, say, with a shaft with an ivory ferrule?