I've been hunting about for the large, clear tumblers that we've seen Sharon & Rusty use over the last two seasons. I've been idly sniffing about after glass tumblers, but the other day I came across these plastic tumblers--and they're a definite maybe.
The reason the plastic tumblers are appeal to me--is that they're similarly HUGE. Sharon's glasses are no joke. Those things are big. The above pictured "Grace" tumblers (by Zak Designs) come in both a 14oz and a 19oz! So, size-wise, these are right. And easier to live with than glass. Which I tend to break. And am frightened of. A lot.
Not a definitive ID, but I'd say, close enough to satisfy me, and that's darn good.