If you have an MGM Rewards (formerly M Life) card, you can often score 20% off show tickets just for being a member.
Sites like SeatGeek show the final price including fees upfront, so you don't get a heart attack at the checkout screen. buy vegas tickets
When buying for the Sphere , be extremely careful with "obstructed view" warnings; some seats in the 100-level have their view of the top screen blocked by the overhang. If you have an MGM Rewards (formerly M