I just got an XC60 a couple weeks ago with the Costco pricing. You’ll automatically get a price that ends up being $750 above the invoice pricing (6% I believe). You’ll also get a $250 Costco gift card. I negotiated further than the Costco pricing and got a pretty solid deal. I think it had to do with how many competitors there were in the LA area, but with the ease of shipping these days, you can definitely still negotiate using other competitor offers.
Get someone to quote you the Costco price and get another dealer to beat the price, rinse and repeat til you get fairly close to a price you want to pay. Get one of them to bite with the phrase “beat this price by $____ and I’ll come in today.” (Though Memorial Day will be a zoo, if you’re not in a hurry, you may want to wait til next weekend to go in or at least make an appointment.) Once you’re in and you get a number you’re comfortable with, ask them to give you the new price with max MSDs. I started with MSDs on the table and feel like I could’ve gotten better if I waited til the end…