ISO Used Centrifuge for Biodiesel: (Brentwood TN)

Hi, I'm looking for a used/gently used single pass type centrifuge for making waste oil diesel fuel.
I live a few miles South of Nashville, near Cool springs & such, work in South Nashville.
1 of my hobbies is making some waste oil diesel fuel using WMO/Waste Motor Oil, WATF/Waste Automatic Transmission Fluid, & WVO/Waste Vegetable Oil/s when I have the time & energy.
Can also use new Expired cooking oils, & new or used hydraulic oils.
If you're interested let me know, if u know of any source/s let me know.
If a source isn't too far out of my way I might want to go by & get some.
thanks, - Leeroy