Trade for only what you need. Send selection, I pick out what I need, mark on trading sheet how many I kept. Then the return envelope will have a selection of countries of your interest, you mark on trading sheet how many you kept. Stamps are traded one for one, counting only the ones kept. I prefer Western Europe, Scandinavia, Australia/New Zealand, Japan, Portugal and colonies, British colonies, and French colonies. I can offer most countries. Send your 100 different large used foreign commemoratives. I am in need of recent used issues.