Since I posted the item on Fun's Florist (see post below), I have had no response from Case. I guess they do not have an opinion on overcharging. Or, maybe they have one but are unwilling or unprepared to air it in public.
Well, we consumers will just have to more wary and look out for retailers who are out to make a fast buck.
I am happy, though, when I received a message from my blog follower, Shionge, today offering to help.
She suggested that I send her a picture of the plastic roller that I needed and she would check with her office contrator whether they are able to get it from the hardware store.
Thank you very much, Shionge. Here's a picture that I snapped with my