-Pourover coffee cone and kettle (can be had for under $50 combined depending on model) has saved me a ton on buying coffee shop coffee. Plus I don't need to leave home or worry about power outages disrupting my caffeine addiction.
-quarterly unlimited bus pass for $33 versus paying $74/month for parking at work, plus commuting costs. And I can use it to get around town anytime, not just for the commute.
-yet another vote for wahl clippers. The GF doesn't like my head shaved so I'm back to traditional, but they saved me hundreds for years, and I still use them for my beard.
ALMOST making the cut at $55:
-wooden gymnastic rings from MDUSA. I work in the S&C industry, and for my money, I cannot think of a single piece of storebought equipment that is more versatile and effective than a set of rings. There is practically no way to break them. And until you can do plaches, malteses, handstands, front levers, iron crosses, and everything in between, you have not graduated from rings. There are movements ranging from absolute beginner to ungodly superman that you can do with one piece of equipment that weighs a couple of pounds and packs very efficiently into a travel bag. They can be hung from anything that bears your weight, including uneven objects like tree branches. You can't do much for the lower body, but the upper half is covered. My ideal Mustachian gym would just be a set of rings, plus a used olympic bar and plates. MAYBE a squat rack if you wanted to splurge.