According to Falloon (Ducati Desmoquattro Superbikes) 2002 was the last year of production. It should have Ohlins front and rear, closed 996R type fairing and numbered plaque.
As to price it's a buyers market so hard to say - probably around £7K from a dealer.
Needs belts every year/6000 miles so about £500 a service.
As to dealers there aren't any that are universally slated in the southeast.
The thing to be aware of is that the supersport regs for which the R was built are pretty strict so this is a very pure racer for the road. What lets it down is the cylinder heads weren't machined to supersport spec which makes the R a finiky sort to get set up right - they often have fueling problems because the airbox/injectors/CPU are ready to race and the cylinder heads aren't
The slipper clutch can eat plates too.
It is one of the best developed engines Ducati ever made although now superceded by the 749R in the 'special' stakes.