I suspect that you're out of luck. Guyot (yours) only makes one size (38 oz) in the straight-sided single-all design.

IMHO, this is quite short-sighted of them. With their total lack of wisdom and sense, when they decided to offer a smaller size, they thought it would be a good idea to make the base smaller than the top, so it would be less stable. American design in action: good idea, poor follow-through. <img src="/images/graemlins/tongue.gif" alt="" />

Sue