This is not about A SHOP but about a town, a very small town, Hay on Wye. It is right up against the border with Wales and I have to confess that I originally had placed this, erroneously, in my Powis journal!
Most specialist towns look way back in history for the origin of their specialism; not so Hay. Richard Booth only started what is now his enormous shop in the early 1960s and now Hay has 38 shops selling second hand books.
Some of the shops sell books of all descriptions while others are vigorously specialist. [This is one place where a speciality bookshop does not simply specialise in books.] Everything is available from the cheap second handers similar to what can be bought in any local market up to rare first editions.
Richard Booth's shop is still the biggest in the town - perhaps in the world! - and claims to have over a million second hand books available at any one time. The old cinema building, shared between more than one shop is very well known. Much more can be gleaned by just putting 'hay books' into a search engine. You will find that I am not exaggerating.