Also, realizing maximum cards from other countries is difficult. There are language problems, postage problems, etc. So what you might do is find a trading partner in another country. He or she might send you maximum cards from his or her country, and you in turn send maximum cards from your country. Just as with stamp collecting, people collect all sorts of different maximum cards.
Many collectors focus on a certain topic.
For instance, I collect maximum cards about the American Revolution. I have seen collections of movie star maximum cards, teddy bear maximum cards, butterflies, sports figures, animals, parks, presidents, the olympics. Whatever topic you like can make a wonderful maximum card collection. Some of the easiest ways are to visit garage and rummage sales in your area. Some thrift shops will have old cards you can look through.