Yes,
Cabela's lists the Kodiak Double Express in 50, 54, 58, and 72 Caliber. From 829 to 859 bucks. Pretty fair price, I would say.

But, could you imagine shooting that 72 cal sucker!!!!!
Got to kick like two mules.
How about if ya fanger slipped and ya let go both barrels at ONCE!!!!
OMG!!!!!!

It would probably knock yer butt about as far as the deer!!

But, I have to say, I wouldn't mind havin one in 50 cal. It has a 1 in 24' twist and would probably shoot sabots pretty well.

R
Hank