It isn't just the cost of shipping. It is for them to "handle" your item (dump it in a box and then slap a shipping label) that is costing you.
I've found recently that most places are jacking up S&H to boost profits while "appearing" to be low cost. It really grinds my gears.
I recently paid extra to have my items handled into a shot up box by a local retailer. Boy was I pissed. I really don't care if they reuse a box but DAMN at least make it presentable. At least he taped it to shit to make it structurally sound.
Had I been around to sign for the package I would have down right refused it and asked for a refund.