I often buy cut price guide books
- I often use companies like "The Works" bookshop, and I've now got quite a home library.
However - one little word of warning.
The books are usually cut price because they are older editions.

I fell down a deep dark hole by buying a very old version Lonely Planet guide for Croatia last year.
Following my trusty guide book I caught the local bus from Porec down to Pula, intending to go visit the Roman ruins. The guide book gave me clear instructions about "walls facing the bus station", and "following the walls south" to get to the ruins.
Unfortunately between my old guide book and now - there have been changes.
The bus station had been moved to a completely different part of town, and I didn't know.
Wrong bus station, wrong walls, wrong everything!
To cut a long story short, I ended up hopelessly lost in a very industrial, graffiti scarred, unpleasant, ruined part of Pula, wandering around for hours, getting increasingly frustrated.

I know the feeling, I once got stranded in Portugal for three hours after following a Lonely Planet map to the station - only to find it was a vehicle testing station not the railway station!

Anyway, I bought the Italian Lakes book (which is 40% Milan) and it's the 2009 version which Amazon are still selling for £12.59.