Same thing happened to me. It showed no charge, until the VERY END, like right before you have to confirm the install, etc. It added it to the 1st monthly total on the right hand side. Also which I thought was odd was the package was supposed to be $39.99 (AT 250), which they didn't add into the math, I know it's a "rebate" but it left us (Wife and I sat down together to order) confused and wondering why it was $49.99. Atleast D* added it into there math, with a * that said "With instant rebate" or something to that effect.
I found the Dish ordering process (online atleast) very confusing and frustrating, leaving me with alot of questions and pondering. I like the new website, but I think it's confusing to navigate, and actually doesn't say anything about free receivers.