Every year or two, I may want to get a new pair of corrective lenses and frame. So far, I have only needed relatively simple lenses, so much that I have bought them through the world wide web of computers as to obtain a price far smaller than the price of the stores geographically close.
A new supplier will have to be as good as the current one in price and still offer advantages. Differentials that may interest me: faster delivery, thinner lenses, lens coverage treatments.
Current supplier: Goggles4U.