I just ordered prescription sunglasses and regular glasses online. I use progressive lenses and have a pretty strong correction for near-sightedness. I paid a fraction of what I pay in Thailand buy ordering them online from the US. I got progressive lenses, ultra thin with a UV coating in a really nice frame for around $78(2750 baht). Shipping via DHL is another $29. I paid 11,000 baht for my last pair here in Thailand. Quite a significant saving.