Cheap skate shows are getting harder and harder to find in Las Vegas but one time that you can find them is the afternoon shows. They usually have a comedian and a magic act and then maybe some variety act and showgirls. One such show is Viva Las Vegas at the Stratosphere where they have shows Monday to Saturday at 2pm and 4pm. Don't expect elaborate sets or staging it just good inexpensive family entertainment and hey its cheaper than spending money gambling. I have included a link to get you in for $9.95 plus taxes with the purchase of one drink.
$10 Off Viva Las Vegas Link