[Gremlin]

Mine is not jail broken and it accepts the card reader.
It's just a little plastic thing about inch and a half square with a iPad connector at one side and two card slots at the other.
It was not expensive from the online retailer A.

Apple sell them so I don't think they would do if they needed a jail broken iPad to use it.
They are fare cheaper from elsewhere.
I am not sure but I think Toscos Accy store sell them
As does a shop in Ossy on the right after Ossy mills.