Boots Opticians are expensive than police glasses?

[Wickenburg]

Went to Boots for my sight test today and I've seen a nice pair of Police glasses frames. The girl who served me said that I need thinned down lenses as my sight test results had gone up in power quite a lot since 3 years ago. They quoted me over 300 as the frame on it's own is 199. Does anyone know where I can find the same Police glasses at a cheaper price? I don't really want to buy online as the girl said this would be very risky. I need to know a high street shop that sells them cheap.

[Lamoine]

In my opinion, once search at online stores which are offering the glasses at best prices. Some stores offer the glasses which you are searching at very affordable prices on seasonal periods. So, Once look at for wider range of sunglasses.