One of my usual New Year's resolutions is to try and save more money in the upcoming year. One expense that always chips away at my wallet is the constant need to stay caffeinated in the mornings or after lunch. Maybe I should get more sleep? Nah, coffee's fine.

Coffee fiends like me looking to save some hard-earned moolah will want to check out Starbucks' Brewed Refill Tumbler that can be purchased at participating stores in the United States. Customers who buy the tumbler will receive free coffee throughout the month of January 2019.

All you have to do is present the tumbler to a barista at a participating location for one free grande (16 fluid ounces) of either brewed hot coffee or brewed hot tea between January 1 through January 31, 2019.

While the tumbler costs $40, a month of free coffee (at $2.45) costs approximately $75.95 before taxes – and you get a sweet insulated mug out of it.

In the long run, you're saving. Especially if you're a habitual coffee drinker.

Those looking to get their hands on one of these stainless steel coffee tumblers can find them at participating Starbucks stores now while supplies last.