Donny, I have a 4" rotary table that I am planning to convert. It came with a tailstock, and has a #2 Morse taper in it, which is a requirement for my purpose. It is built like a tank, weights about 20 lbs. Cost about $200 with tailstock and a dividing plate set, brand new.
www.littlemachineshop.com
HF has 3" and a 4" rotary tables for under $100 that look like good candidates for conversion, but no Morse taper in them.
The head and tailstock from a Taig lathe could be easily made into a lighter weight 4th axis too. The head is about $60, and a timing belt pulley can be easily fitted. The head has very convenient slots on top. It would be easy to fit a bracket for a motor.