The Best Buy qualifier makes it a lot harder. If you're willing to let that go, System 76 and Purism sell amazing devices with not only good Linux distros pre-installed, but also as much free software (close to 100%) throughout the whole stack, which is a real benefit to security and freedom.

If you weaken "turnkey" a bit to include installation you'll find that most Laptops on sale today will run the popular Linux distributions flawlessly.