I'll second Lupinus, I have never heard of an optometrist or optician that didn't have access to prescription safety glasses. Depending on what kind of company you work for check with the safety department. Many companies will provide safety glasses at little or no cost to employees. My company will provide one pair of safety glasses per each union contract for union employees, others can purchase them at a nominal cost. I recently got new ones, since I haven't had any in a few years, even though they are not required for my immediate job. At the same time I ordered a second pair to use for shooting, even told me that was what they were for, that pair cost me a whole $49, with an upgrade frame. Told them I'll be back in the near future to get another pair with tinted lenses to use for sunglasses. Those will set me back a bit more because of the tint but even if I get premium frames it will probably be less than $100. Purchasing one pair from my optometrist would probably cost the better part of $200, if I was lucky.