high torque dc motor

[dug1]

I am developing a power driver that is going to require a dc gear motor with the following specs.

18-24 volt dc
at least 80 ft lbs torque
about 3" motor diameter
15 rpm
1/2" output shaft
would like it to be as short as possible
could be straight configuration or with right angle gear box

Does anyone know a reliable source or can anybody build such a thing? If this works we would be looking at thousands. I have bought one expensive one and it does what we want just looking for a less expensive supplier.
Please call 217-841-6645 or respond here.
TIA

 

[Minder]

I recently picked up a couple new/surplus automotive 12vdc geared seat motors <$10.00 , not sure of the price full retail,
12v though!
I would think there a few selections out on the web, Chinese maybe?