I have just ordered my first pair of glasses in specsavers in 10 years, ended up paying around $400 mark, which is much less than what OPSM would've charge with a similar lenses and frame, which would be around 7-800 $ mark.
Service was pretty good and helpful, and they seem to be more open with their prices. They have a brochure with all the lens variation and add-ons listed with prices.