I use Mobil One synthetic oil in my car (when I remember to check the oil), so in a moment of curiousity, I decided to check the turbine oil. For a minute I thought I was reading the page wrong. It showed a 1 quart can (wow, it still comes in a can, how quaint), but the price seemed more in line with a 50 gallon barrel. Well the real answer was somewhere in the middle: one case (24 cans) of Jet 254 is $230.50 shipping included.
Good thing I don't need to do an oil change on a turbo-prop any time soon.