The local prizes are the couple at the top of the list, usually with an asterix next to it ('cept for 108), and everything below that the people across 180 other stations are all bidding on the same prize. So I don't think you can bid too much on a national prize.
Are you sure it was the same tablet Sol? Look under 'Closed Contests' to see if the one you were thinking of is there.
Good to see you Dixie!