O is rarely discounted, the rest you can get at Tix4Tonight, but not half off, maybe 20%.

Check http://www.travelzoo.com and http://www.smartervegas.com

These are the current prices at T4T, from:-

Ka - $84
Love - $93
Viva Elvis - $62
Zumanity - $52

However the best deals at the moment are the Summer of Cirque:-

Beatles LOVE: (offer code: MIRAGE )
https://oss.ticketmaster.com/html/go...40000661&g=503

Mystere: (promo code: summer )
https://ti.outboxtickets.com/zope/we...omoCode=summer

Zumanity: (offer code: Zumanity )
https://oss.ticketmaster.com/html/go...39005926&g=495

Chris Angel Believe: (offer code: Luxor )
https://oss.ticketmaster.com/html/gr...t=&customerID=

Viva Elvis: (offer code: ARIA )
https://oss.ticketmaster.com/html/gr...t=&customerID=

KA: (use the drop-down in the upper right corner to change month display, then after you click "Find Tickets" for your date, change the "Price Level:" to "C" for the $55 seats, and be sure to choose the number of tickets you want from the drop-down just below that which is labeled "Summer Offer:")
https://reservations.mgmmirage.com/b...eKASummerOffer

O - 20% off May
https://reservations.mgmmirage.com/b...e=internet20ot

Keep checking the O one as it might be extended.

Between O and Ka I think I would choose O if you can get the discount on it as that happens so rarely. You can always get offers on Ka.

luci

Several Cirque shows are up to 50% off at the moment on http://www.travelzoo.com in 'Entertainment Deals'

Ka from $55
Viva Elvis from $55
Mystere from $55
LOVE from $55

I won't bother mentioning Zumanity and Criss Angel - not worth seeing

Cheers,

TC