Yes,
Last October I think they were $10.99 or $9.99.
We actually always get some really cool looking mugs at VB that we don't see at WDW.
Our kids really like the Halloween one from last year that glows in the dark.
I can't say if we actually save money. We buy them mostly for our kids-they enjoy using them at home. We usually buy some soda for the room and use those to drink out of. I'm not a big fan of the soda at Bleachers-always tastes flat-JMHO-doesn't mean I like the resort any less.
VB has pretty good lemonade that you can get in these cups. Our kids also like the cherry cokes-they always put a ton of cherries in the cup.