The problem is most dealers do adjust prices, so if it is a practice in the bussiness then why would you get upset when someone asks. Like it or not a local dealer is a place where people expect the price to be flexible. Most people do not expect the prices to change at the local supermarket, your right but now make that the local farmers market and people do expect prices to change.
There are just places that the price tag is just a place to start, would you walk into a car dealer and pay the "price tag on the car or truck" NO, I am sure none of you just walk in and say yes I think $30,000 is a good price where do I sign, no you go what can you do how about $28K the dealer say how about $29K and along the way you come to a deal. Like it or not most people expect the same thing in a power equipment dealership. And yes the same people would never think of walking into Lowes or HD and asking for a lower price, but a few do and at times it works. I saw a guy get 20% off a grill just by asking the manager if they would knock a few bucks off to get rid of the grill before the winter. So even in the big box stores prices can be flexible.