New Horizons is one-of-a-kind manufacturer--I expect that if you can afford to consider them, you will need to be able to deal on their terms.
But, yes, higher discounts off "retail pricing" are available from other mfgs, but the problem is--how do you determine what the list price should be/actually is/may be inflated, to get the higher discounts?
Perhaps, NH is more realistic about pricing as their potential buyers should be a smaller group of expectant owners.
Joe