Yep, good dealer and good company. Montana's take on this is thtt if you need a part that you can get local and it will get a customer going quickly, handle it that way and they will make good on it for the dealer.
Let me state that this is for the dealer!!!! They very well may look at that NAPA bill and compare it to what they can get the hoses for and decide to only give the dealer his cost for the four hoses. In that case, you really do have the dealer to thank because they could easily tell you they will only pay you what Montana will pay them.
The first step should always be to call the dealer and then if they tell you to get NAPA hoses, get NAPA hoses but best to check first to make sure they will be able to have it covered for you.
BTW, I spent 8 years in the hydraulic service industry and that does sound like a pretty big bill for four hoses of that size! There is a huge range in quality and price out there and also, like with most things, a big difference in the knowledge of the shop. The NAPA's around here use Weatherhead hose and fittings but some stores only have one or two guys that really know how to make hoses. You gotta hope a good one is working when you need something!
Ken