I e-mailed the crew at Bullseye
and they are working on a system capable of 2000. Cost and timing unknown (to me) - suggest you call.
TargetCam already has a system capable of 2500 (line of sight) - see here
. Its $785 with one camera and includes a 7" hi-res display (no computer required). Good reviews and the price is the best I've found for this distance, especially with the included display.
At SHOT 2013 Oakwood Controls had a system that will go to 20km (20 kilometers - line of sight) but the price is a LOT steeper. Their system picks up the projectile as it passes sensors downrange and plots the shot on a PC screen. All you need is a point of aim immediately behind the sensors. Look for a lot more info from this company in the next 90 days.