Chase...
I ran into the same problem trying to find some fluid to have on hand just in case (top off, etc.) after I bought mine in May. I ended up calling my Dealer and asked about the fluid I found at TSC (their "Traveller Premium Hydraulic Fluid") as it meets the Kubota UDT and John Deere J20C specs and he said that it was okay to use.
Also, check at a more rural (& I mean more in the farming area - if you have any areas like that around you) Wal-Mart to see if they have a Shell product. I just saw a 5 gallon bucket of Shell's fluid at a rural Wal-Mart but I can't find it at my local WM stores.
Hope this helps...good luck! Anyone else have any other advice to offer...would love to hear & learn!:thumbsup: