NRAS "entitlements" do cost money, because Approved Participants (consortiums) incur costs in obtaining them on behalf of developers. But it's the developer who chooses to ask for them from the consortium, so its the developer who should absorb the cost. It should never be passed on to the buyer.
They've pulled a sneaky here- instead of absorbing the price of the NRAS "entitlement" into their sale price, and knowing they would not be able to get away with loading the sale price by 5.5K and creating a two tier pricing model for their NRAS and non NRAS stock, they've decided to keep all stock at the same price and charged you extra via an external mechanism, instead.
I think they should refund you the money. If they have elected to use NRAS on their stock to help sell more of it, it should be at their cost- not yours. I'd complain to the WA Dept Of Commerce