I found out today while getting new glasses for my wife that "Foreyes Optical" is having a 50% sale for teachers and facility thru the end of the month. This may include mentors if you ask nicely and if they feel you are teaching. You can go to their website
www.foreyes.com/ for locations and coupon. I do not work for or represent Foreyes Optical. I have used prescription safety glasses for years and like having them.