There are many prepaid cards, and their rates are radically different. If you go to the www.belizeans.com
web site you need to look up the rates using the destinations you are going to be calling TO and where you are going to be calling FROM. The same card will not work for calling to the Belize from the US and calling the US (or other countries) FROM Belize. Mostly, we use these cards here in the US to call TO Belize and Panama. When I recently visited Belize,I ordered a couple of cards specifically to use to call FROM Belize and saved some money that way too (the rates were lower than using ATT MCI or SPRINT to call via the "115" operator line and way cheaper than calling direct via BTL.)
But they were different cards than the ones I use to call TO Belize.
It's easy to pick and choose the cards using the search directory they provide on the web site.