Packaging and Labeling Bars

Things that are probably easy to do in Europe or the United States are a bit more difficult in a third world country. I am looking for the best option for packaging chocolate bars and chocolate pieces. I am looking for foil wrapping papers here in Costa Rica that are affordable and a printing company to print the labels. There are plenty of printing companies around here so that part won't be a problem. I did see a YouTube video that in which a woman showed a clear, plastic sleeve with a gummed end that she put her chocolates into. That looked like the easiest way to seal the chocolate bars. (She was repackaging Hershey's Bars for a child's party. I am not doing that!) I am guessing those sleeves may be available in hobby shops in the states. If anyone knows about this product, could you let me know and I may be able to get someone to bring them to me. I am also interested in knowing, from others who do hand packaging, what options they have found that work. Thanks for reading. Sharron