I just checked Elton John's show for this weekend and it looks like tickets range from $55 to $500 for the front (rows 1 and 5 both had tix for $500). I'm glad I'm getting a raise soon, I still haven't paid off the 4 Charmbracelet concerts from my credit card 
I'm going to Vegas this weekend, I'll see if Caesars has any signs up.
I wonder if she'll be announcing other US tour dates and this is just an extended stop.