UK map offer
Corporate Member Ordnance Survey (OS) is offering 3 maps for just £20.
You can mix-and-match Explorer 1:25,000 and Landranger 1:50,000 maps for the offer - just go to the OS link below . . but the offer lasts only to 22 May.
OS, operating since 1791, makes the most current and accurate digital and paper maps of the UK, every day making over 10,000 changes to its database of more than 450 million geographic features.