Mega Package?

This afternoon on Videotron's website I tried to change a couple channels in my 20 extra channels package (I've done this before, but quite awhile ago). I unselected 2 of the channels, and selected 2 new ones. When I clicked on "Validate", instead of going to the confirmation screen, I got a message saying "The total cost of the preassembled packages or Custom packages that you have chosen exceeds the price of the Mega package. The Mega package is available at a lower rate than your selections". I wasn't able to get past this to get the 2 new channels. So I tried to check what channels I'd get with the Mega package but couldn't find it anywhere on Videotron's website. Am I missing something here, or doing something wrong?