Something is wrong on the internet!
Look at the link below for an example of a discount when configured with no Windows: Select FreeDOS and get a $100 discount - okay so there are some issues that this impacts such as OS Warranty etc: http://h71016.www7.hp.com/dstore/MiddleFrame.asp?page=config&ProductLineId=539&FamilyId=3377&BaseId=35568&oi=E9CED&BEID=19701&SBLID=
I can't seem to find a similar setup on the UK pages though, but usability of the website isn't what we are discussing. Sorry for the pedantic follow up, but just wanted to show that bundling isn't always forced.