The meat-slinger got on board the Impossible train at the start of the year, after a test in St. Louis proved to be a resounding success. So far, it's landed in Miami, Montgomery (Alabama) and Columbus (Georgia), with more cities planned for later in the year.
There are two limits on how fast BK can roll out the burgers: the logistics of updating a burger chain's menus, and Impossible's production time. Right now, the company has just one factory, in Oakland, which can produce just 1.5 million pounds of fake meat a month.
Prices may vary from location to location, but a general rule of thumb is that the Impossible Whopper is only a buck more expensive than the regular variety. And the extra cash has gotta be worth it, if only to sate your curiosity, and to avoid all of the downsides of eating red meat.