Both these sites sell refurbished Dell stock which usually means the box has been opened but nothing more.
This site (
http://www.europc.co.uk/pages/filter.aspx?cat=53 ) has the Dell 2005FP for £316 inc vat. The problem is the resolution only goes up to 1680 x 1050 which probably won't allow you to multitable without overlap.
I bought 2 Dell monitors from this site (
http://www.sterlingxs.co.uk/scpages/cheapdellultrasharpmonitors.html ) but they only have the 17" Ultrasharps (£140) at the moment. They have them listed as cancelled stock so they are new. They are also much cheaper than EuroPC. The resolution only goes up to 1280 x 1024 so you will have some overlap if you run 2 tables on one monitor. The 17" is a very good monitor and for £280 you could run two which is very usefull is you are running PokerTracker as well. I bought a 17" and a 19" but as the resolution of the 19" is the same there is not a big difference between the two.
I also found this site (
http://www.itcsales.co.uk/acatalog/TFT_Displays.html ) which sells the 2001FP for £340 and this will give 1600 x 1200. If you search for "Dell outlet stock" in Google you will get a good choice of sellers.
I would avoid using eBay for flat screen monitors as you will end up paying more than buying from Dell outlet resellers