Off the top of my head - we will go to Chinatown and hit the dim sum joints, Hai La Moon - meal for two - less than 60 bucks - with tip.
MFA has days where the price is discounted and you can pay what you want.. https://www.mfa.org/visit/free-and-discounted-admission
Cheap shit is everywhere. All you gotta do is do a bit of digging to find it.