You can go to the Forum Shops and mall. It has plenty to see and do and free, off course. Getting a great place to eat or get souvenirs for your trip, then The Cheesecake Factory and Bertollinis offers excellent meals at affordable prices, often with portions big enough to share.
As there are so many free or priceless place and services, generally Las Vegas is the expensive “Night City”. You have to manage your money as well, try to limit yourself to just browsing whenever possible if you are trying to stick to a budget.
For you that come to Vegas for the gambling, consider Slots of Fun Las Vegas. The gambling, food, and drinks are cheaper than else. Or you can just interested on Online Slots For Real Money that you can play at onlineslots-realmoney.com