+1 for dpsb.co.uk. A proper company with good service and excellent prices - I bought my printer, display and scanner from them, and a lot of consummables over the years.
It seems a good reseller, however I had to send an email to get an estimate of the shipping cost for 50 A3+ sheets.It's so "2002" to ask for it instead of having ready made estimates for weight/european country.Still waiting for a response...
Well I am afraid that is a UK thing, we do not really 'get' the web here just yet. Really good ecommerce sites are a minority in the UK (private and govt sector) and I am afraid the dpsb is no exception - it is poorly designed and its speed is glacial - but worth it once conquered.