How much?

Eye check today and as i suspect my vision has improved again so the glasses I am currently wearing are too strong, they are also 7 years old and looking rather worse for wear.

However the opticians charges £120 just for lenses and this I simply cant afford when I could get a whole pair for that and less else where so I am shopping around. Was thinking a bogof deal and paying the upgrade fee for my reactions but after checking my sunglasses I can see out of them fine and they meet the legal requirements for driving so think I just going to go for a single pair which then has the free upgrade to reactions, however I am torn between two pairs so I'm having a little think about it.