As a cab driver in Las Vegas I'm often asked about fun places to go that don't cost a lot. This is definitely in that category.
While most of my friends know this is one of my favorite places to go, I feel the need to Yelp it. The machines in the Pinball Hall of Fame are all in working order (much better than any bar or normal arcade where sometimes the flippers or bumpers work when they want to) and are really inexpensive to play. Most of the machines are a quarter or two.
They also have an assortment of older video games for those of you who aren't into playing really cool vintage pinball machines.
Either way, this is definitely a place you should visit if you're here in Vegas!