Weird.
I first went to Mr. Coffey's own website for you (coffeymarketing.com, I think) and neither of the two he used to sell were on there. Thinking maybe he had signed an exclusive so as not to compete with Bass Pro or Cabela's, I went to their websites... nothing. I know they've got them in stores, because I just saw one in both last week. Gander also sells them.
As far as online, I had to go to more obscure sites like this to find them:
http://www.yeoldearcheryshoppe.com/coffey-digital-deer-scale-p-4108.html
I couldn't tell you much about the holding weight feature, because all I can get mine to show is peak weight. Maybe it shows holding weight in real time, in which case my head's not up there to see it because I'm pulling down on my bow while the sting is on an eye hook screwed into one of my rafters. [8D]