Wen - I think it's "reasonable", even if you pay retail for it. (That was for your benefit, Bird. /w3tcompact/icons/smile.gif)
Seriously, though, you can call Amsoil and ask for names of local dealers, order from them directly, or become a dealer yourself to get it at dealer prices. I chose the latter.
As for the hydraulic oil, with it holding that much, I'd send a sample off for analysis when it's time for the second change. If you change the filters at the normal intervals, you probably won't have to change it for 4 to 5 times the interval for petroleum. So, you'd end up saving money just on the oil, much less the reduced wear and better performance.
Mark