Earlier this spring they were not selling the YOMD at POFQ...at least not in the food court. As far as I know their rule is still one mug per resort and it is not to be used for a second trip. At least everything I've read says that.
Here are the notes from allearsnet.com
You purchase a mug for around $11.99 and are entitled to "free" or less expensive refills for the duration of your stay. The refills are available from the beverage dispensers and usually include: coffee, sodas, ice tea, and hot chocolate. No other purchase is required to get your mug or your refills.
The mugs have the hotel logo on them and signs state that they are for use at that hotel for the duration of your visit.
For an avid coffee or soda drinker, especially with the 'free' refills,
you can't beat it.
The table below outlines the refillable mugs available at the resorts and the purchase as well as refill price. Be sure to add 6% tax to the purchase price.