I don't think it's good that Andy/GNUS said nothing about the debut of the "Llama Llama" DVD.
If you are talking about the Amazon rank, there isn't a translation into actual sales numbers. The rank is relative to the sales of others in the same category. Rank #1 being the best seller.
With DVD sales dropping, I'd like to see the sales rank # in the single digits.
Today's #'s:
Looks better than yesterday, but, still not good enough. I haven't seen a website that gives sales numbers for TV seasons, but movie DVD sales can be tracked here: