You can see the plastic yard of ale near the mirror - It cost more than one glass of beer - BUT you can get refills !!

I would refill our yard, and then pour it into my dad and dh's glass - it ended up being very cost effective - imho!!
In England you an get it at Rose and Crown, there is an outdoor stand that sells beer, if no one is at that stand, you can go inside and order the yard of ale!!
and not to start the refillable mug debate, I did bring it each time we went to Epcot and paid to refill the yard!! Be careful of that last swallow, with the bubble in the bottom of the cup it can rush up and over the side (spilling down your shirt front, and causing much laughter!!)
Prices: Souvenir Half Yard $11.00, Refill $6.00, Imperial Pint $6.00, Half Pint $3.75
Imperial Sampler - Guinness Stout, Bass Ale, Harp Tennants Lager, and Caffrey's Irish Ale - 5 samples 4 oz. each $8.25