According to the different quality at the lenses, designs of the eyeglasses, materials at the frames and so on, the price of prescription eyeglasses may be ranging from $15 to $100. If you want to own the eyeglasses with good quality at both the frames and the lenses, you may prepare a little more money.
Yes Boots can provide prescription eyeglasses.
You can take a look at its official website: http://www.boots.com ,and at the department of glasses, there are different kinds of glasses sold online or in local stores, such as glasses for women , glasses for men , glasses for children and prescription sunglasses.
And the prices ranges from about 25 to 259 pounds, and a lot of them are at about 79 pounds.
You can choose one online according to your own taste.
Hope it will be helpful for you.