Bought 2 new Yamahas in the past decade.
Need to buy, when they are not selling.
Need to be working with more than one dealership (you have options).
Need to be working with the dealership owner, not the sales guy. (owners have different incentives besides cash).
Need to have hard cash (or equivalent) and offer an all-in deal (I don't care how they split it up).
Bought my '16 242X (MSRP 72,999, i think), in Nov (Virginia).
70K, all-in. Taxes, tags, deluxe cover, anchor, 2 years YES (bought in Nov, they didn't register with Yamaha until Jan boat show warranty special. Got extra year.), and 6 months of 10% discount for accessories/supplies.
Handed the owner the check and made it his decision to take or not.
Had bought my previous Yamaha in NJ because they were more motivated. (My local dealer could get the business, or lose it again...)
For my previous boat, I found one of the highest volume Yamaha dealerships on the East coast, in NJ. (they have the best discounting rate from OEM). Got negotiating with the owner in May, June,... but he held most of the cards (prime selling season.). Was literally driving to NY (native home) the 4th of July wknd and when the family stopped on the NJ Turnpike, I realized we were just a few miles from this dealership. I called the owner and told him if he did X price, I'd be at his dealership in 15 minutes to pay and take the boat. I didn't know then (but do now!) that for NY/NJ, his boat sales largely stop after the 4th of July. He became a motivated seller after the 4th b/c he saw most remaining boats as a storage PIA for the coming Winter. He sold it at my price. It took 3 hours to prep before we could leave, but we had a boat to play with for the 4th of july wknd.
.02
(Yes, I know working with the owner often cuts out the sales guy, "..., and those guys/gals have to eat." They can, just not with my money. Sorry. It's a zero-sum game and I'm unashamedly biased for my team/family.) Now NEVER hose over the service manager. That guy you will need in the future! ;-)