I called RS and one guy said some stores have them but then he couldn't find them at all in the system. Apparently they've stopped carrying them?
The problem is its a decently complex system consisting of a three wheeled chassis with two servo motors to move it, a pair of ultrasonic sensors, and a pair of IR sensors designed for collision avoidance. I wouldn't know how to simulate all that...
The good news is my partner thinks he can get the parts from another team *whew* 😱 Saved my ass....