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It's stocked by OCUK for £24
I wanted to chime in and say I, too, received my 6870 on Thursday. I picked up one of those Mini DP to DVI things from Best Buy that Apple and Dynex make, and it did NOT allow me to use the 3rd display. This may be obvious knowledge to some of you, but I know me and a couple others were curious. I ended up purchasing one of these instead link. It will be here tomorrow, so hopefully I'll be in business.
Looks like the rumors of passive adaptors being good enough for 6xxx series cards is false.. Perhaps the new 28nm cards will have more clock generators.
Just got the above Accell adapter this morning and snuck home from work to give it a try. So far 3 monitors is working in Windows! Haven't gotten any games configured with it yet (reinstalling F1 2010 as I type, so I'll see how that goes later.) Hope this helps anyone else with any doubts.