Unfortunately whilst I do tend to avoid traditional shops, a problem with working from home is the number of things you can buy online. I'm a huge sucker for books and if your looking for CHEAP books I highly highly recommend bookdepository.co.uk They always have books tonnes cheaper then any other online store, and even though its from the UK postage is free.
Todays damage was:
Grid Systems in Graphic Design (Hardback)
By (author) Josef Muller-Brockmann
We Make Magazines: Inside the Independents(Paperback)
Edited by Andrew Losowsky, Edited by Jeremy Leslie, Edited by Mike Koedinger
Symbols Signs: Explorations (Sheet map)
by Adrian Frutiger