Large plastic cup

Ok...this will be waaaayyyy off topic. I want to know if anyone knows where I can buy a really large cup. I used to have this 64 oz plastic cup, like the one you get at 7-11, except it was a thick clear blue double walled plastic cup. I bought it at a conrning ware sale, but they apparently don't make those anymore. If anyone has any idea where to get this I'd be really happy!