Micro transactions
Microtransactions in Video games that I already spend a good amount of money on.
if you asked me this a year ago i would have said anything i can feasibly shoplift
Food delivery, usually. I will get my ass up and pick up my food. Delivery and tip just takes the food expenditure to a point too high for my vaguely frugal preferences.
Bottled water. I invested once in a big ass Nalgene bottle and just refill that.