<Last fall we bought a mug from the DLH coffee shop, and it was good for free refills of drip coffee from their shop for the duration of our stay. I think it cost around $7 and one cup was maybe $1.50 - $2, it was well worth the cost if you're going to get one every day.>
<Coke Corner is also the only one who will refill their cups, so...yes. Also, some of their employees are not aware of this (most are but heard a couple friends in November that had a bad experience with one who didn't and laughed at them.)>
I don't think this is exactly what you meant, but...