Found some accommodation (incognito window) using booking dot com, which turned out to be $675 for two nights. Happy with that, so I checked good ol' Cashrewards and Shopback, and as luck would have it, one of them (Cashrewards) had 12% back on booking dot com.
Clicked through from Cashrewards, price for the exact same room goes up to $770. Even with 12% cashback (after x days), you still lose.
Tried on mobile, same result. Being logged in (or not) made no difference. Different browser, same issue. Tried with Shopback - same result.
They have a giant welcome banner, with jacked pricing when they know you've been directed there from Cashrewards.
When i booked Europe with that site, pricing didn't change and was even 10% cheaper on mobile in addition to the genius discount.