Many builders in Eastern Canada, including myself, buy Avex rivets from Avdel, Division of Textron Canada, in Toronto. Address is 87 Disco Road, REXDALE, Ontario M9W 1M3. 1-800-268-9947. Price is less than half of what ZAC charges for them. They should be able to help you if you ask for the A4 and A5 blind rivet used for Zenith aircraft construction. Good luck.