If you only need 3 axis movement, check out SCARA robots, these are used extensively in the simiconductor industry. Very fast, extremely precise. There are several manufacturers including Adept as mentioned by Milacron.
You can also, as mentioned, go with a gantry set-up, you can buy pre-configured units from folks like Festo, Schunk, and several others.
If you need 4 or 6 axis motion, look at a Kawasaki FS3 or FS6. (Probably the new RS by now, which is *extremely fast* for an articulated arm robot).
Questions:
What is the Kg load to be moved?
What is the actual distance to be moved?
What is the cycle time required?
What will your EOAT (end of arm tooling) weight?
What type of EOAT will be needed (suction cup/gripper/custom/etc)
Does the part need re-oriented during transport?
Ballpark Project Budget?
The more information you can provide to us, the better we will be able to help you narrow your search.