You can get Gift cards on-line in increments of $25 $50 & $100 at Disney.com. The downside is it costs $14.00 to ship them. To make it worth the $14.00 I saved up $600.00 (for dining) and waited until the dollar reached .93. That way, I locked in the decent exchange rate and don't have to mess around with exchange + additional charges on the CC when we go in Nov.
As far as I know, we cannot get Disney dollars up here.