Hy trans (IH) and hy guard (JD) are good fluids but at a cost.
Traveller at TSC is a good replacement at a lesser cost.
Todays cost is $10.00 a gallon in a 5 gallon pail.
DO NOT use 505 Hydraulic fluid, its too thick at lower temps,
and there have been other problems in the past.
I'm thinking it has been mentioned of a supplier in the recent past that sells the hyd cylinders at a reduced cost other than OEM suppliers.
Some one should chime in with a link.