Haha, garysteph! I was just going to say the same thing. Don't leave home without it.
With that being said, we always use the Scotia Bank when we are there to withdraw JA. Our bank gives us the best rate of the day and the best part is NO bank service charges, no haggling.
We always head down with a handful of small US dollars to get us through until we can hit the ATM.
The Scotia ATM does have a small fee attached to it, think it works out to about $2.00.