Best buy on calling card?

Hi all! We were at Costco today and they sell Verizon cards at the Seattle area stores. Unfortunately, there was no information about rates on the package and when I called Verizon tonight, they couldn't help me unless I had the access number and PIN. In looking at the MCI info online, it looks like calls from Ecuador, Peru and Bolivia are $0.60, $0.50, $0.60, respectively. Anyone found a better deal or know what the Costco rates are? Thanks!