/diy/ - Do It Yourself

This isn't really purely 3dprinting related, more cnc in general but I thought maybe you guys can help:
I want to have a 1 meter rail, run that with a motor and on the sled have another rail that can extrude ~10 cm upwards. It doesnt have to be accurate, a tolerance of +- 1 cm on the 1m rail is okay. How would I go with that? What rail and Sleds are cheap? (cost is my primary concern) How do I drive the sled? With a stepper and a wheel? Threaded rods seem unneccessary because they reduce speed a lot and I don't need the accuracy. Any help on where to look and how to run the sleds is appreciated