Yes its $9.95 for a 24 hour period, some people try get 2 days out of 1 payment. Last month it cost us $129.35 for the 16 nights we were there.
You should look into getting a cheap/2nd hand mifi and an AT&T sim card.
$125 would get you 2.5GB of downloads and it would be completely mobile as well. Probably faster than Disney too given some of the posts recently.
Depends if you do things like watching iplayer etc in which case unlimited wifi is probably better.