We have a preferential supply arrangement with Pentangle Puzzles and Games which gives all BGA members a 15% discount on all Go books and equipment. Details on how to order. 
If you're a novice and not a BGA member then you can still get a 10% discount on basic Go sets and beginners first books . But why not JOIN US  and get the full 15% off all Go books and equipment from Pentangle?
In addition to buying via Pentangle, the BGA bookseller  is able to bring a selection of books and sets to many tournaments, so that members can assess the level of books and the quality of sets prior to deciding to buy. The price will be the same as buying direct from Pentangle, although there is a saving in postage.
Tournament organisers are welcome to contact the BGA bookseller in advance. Availability depends to a large extent on whether the BGA bookseller is due to attend the tournament although sometimes transport arrangements can be made via other players.
Those organising promotional events aimed at beginners can be provided with beginners books and sets heavily discounted and on a sale or return basis. Please contact the BGA bookseller in good time to discuss your requirements.
Players may contact the bookseller  (or email bgabooks at britgo.org) for any special requests, but a mail-order service is not offered; the service is face-to-face.
Go playing sets vary widely in quality. You can get beginner sets under £10, a full-size good board, stones and bowls for under £50 or you can spend £1,000 or more. Some sets have mat or wooden boards of various sizes (9, 13 or 19 lines) and plastic or glass stones. There are also magnetic sets for use when travelling. Example sets can be seen here. 
Don't forget if you're a novice that it is best to start playing on smaller boards before moving up to the large 19x19 one. As an alternative to purchasing a set you could make your own . Making stones can be a difficult, so we'd definitely recommend buying them, printing your own 9x9 or 13x13 board is much easier.
A vast number of Go books are available for study, with more than 200 in English. There are books on many subjects from the opening, through tesuji and middle game, to the end game, and also books that analyse complete games by professionals and other strong players. The level of material ranges from beginner level, through intermediate to advanced (for dan players).
There are various Books for complete beginners . Of these the most thorough book is Teach Yourself Go by Charles Matthews of the Cambridge Go Club, but others are available including Learn Go written and published by Neil Moffatt of Cardiff Go Club.
There are five main publishers of Go books (some of whom also supply Go sets and books/equipment for other Oriental games), with other smaller publishers, or authors, also publishing books:
A Historic English Book list , up to date to December 2010, gives an indication of the level many books are suitable for - beginner, elementary, intermediate or advanced. We also have a list of recent publications  (from 2004 on).
If you want to know more then
There are various Go terms that have come into common use, mostly from Japanese. In case there is no glossary, our extensive list of Japanese Go Terminology  definitions may be useful.Go World  magazine, which was published 4 times are year in Japan until 2012.
We also sell back numbers of our British Go Journal .
 Apart from Pentangle, there are a number of UK retailers  of books and equipment, including good games shops you can visit, as well as non-UK suppliers  that ship to the UK. These include publishers, shops and mail order companies.