It is up to you to get the item to Argos,how you get it there is up to you but you should use te method you quoted inyour listing as that aswhat the buyer pays for and expects.
However there have been reportsof some C & c stores rejecting deliveries, why I don't know, BUT you must make surecthat you package conforms to the requirements of C & C in terms of size /weight etc., as if over size it will be rejected and will prove expensive for you.
I would never offer C & C far to many links in the chain for things to go wrong, and numerous Horror Stories reported on here.
