$321 each.
There's no realistic way for us to do it (we're already planning a Europe trip) but the best way to get her to calm down is to tell her that I can book 8 tickets at that price (we have 11 people including in-laws in our family) and a VRBO is around $4500.
She finally said, maybe in a couple years. But if I'd just said "No" then I'd be the party pooper.