Posted for larry.eversmeyer@faa.gov:

 Valin,
 We have a shop here in Oklahoma City and this  is the only thing that they
 do is forming plastic.  I made a mold out of dental stone trying to form a
 lens for the wing tip.  I finally gave up trying to get the  right shape
 and decided to go with the standard wing tips.  However if I would have
 them form the lens, if my memory serves me right I think they were going
 to charge me about $40.00 per set (this was based on an order of ten sets.
 
 See ya at OSH
 Larry Eversmeyer