I got a coupon email from Dunkin donut for a free travel mug with a purchase of a medium or large beverage purchase. Based on the receipt, this usually cost $4.99.
It is a big plastic cup but the lid is pretty crappy. It barely stays on! No wonder it’s for free. Also, if you refill with this travel mug, hot or iced coffee is only $1.49 until end of April. Not a bad deal, just don’t drink out of it.
Update: I got another lid a couple of days afterwards and it actually works! Now it’s a secured travel mug! Make sure you try on the lid before leaving the store.