KUMALA

Please use the internet-based book store for any bargain textbooks, now I have some which I used most during my times of studies.. W2 d* V7 E+ Z1 k+ G4 q& C
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One is as-you-mentioned "Second Hand Book Store", please use the link: http://www.abebooks.co.uk (This one really rocks, and I believe it should meets most of your demands. )
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% F8 [9 P0 ]4 B2 pThe other one - Amazon, however. It's not always cheaper than Abebooks, but you will find an even wider range of the book selections: http://www.amazon.co.uk
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# U8 O7 _& z9 |8 A" Q, f2 R. g0 zThe third one, which I used not that often, as this one actually has the real book stores all around the UK, named Waterstone's: http://www.waterstones.com9 y6 p- ], X$ W2 N2 E
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Besides, for a postgraduate student, you may not have to purchase every book listed on your reading list, it's just simply because you need to read at least 4 or 5 books for a single course per average. Therefore borrowing from the university library as fast as you can would be even better, yet absolutely cheaper.
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So you don't actually need to walk that far for seeking Bargain shops, everything can be done online.
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2 u% N3 E+ v9 `  [+ \0 R7 |Best regards