Days of everything in Vegas being cheap but the gambling are long gone. To stay and play on the Strip is crazy expensive. Downtown is still a little better. There are still a few decent meal deals downtown if you look hard enough. Rooms are expensive, food is expensive, cabs are expensive, and shows are crazy expensive.
Many years ago, when I was in the USMC and stationed in California, my wife and I would drive to Vegas on a Saturday morning, get a room for next to nothing, each steak and lobster deals for less then $20 bucks for dinner or eat a really good buffet for about the same price, catch a show for $30 bucks, play slots for a few minutes, have a drink and watch a free lounge act, and then get up and drive back. Good fun and cheap weekend getaway. No telling what that would cost you now.