I am with Wallflower on this for sure. We are just simply not supposed to do any unnecessary shopping on Sundays. The ease of shopping online doesn't make it allowable.
That is your opinion. I have my opinion. They are equal.
I'd like to how you could prove that I'm wrong though. The Church went into Crisis (the mainstream Church, hierarchy, etc. fully conquered by the Modernists by 1970) so by the time e-commerce came out, the true voice of the Church was AWOL.
We all just have to do our best before God, using reason and common sense, until the Church is restored and she can clarify such things. When she does, I'll be the first to submit if I'm wrong.