Puma via ebay has PUMA men's boxer briefs (various styles/colors) for $9.99. Shipping is free.
PUMA Men's Training Boxer Briefs [3 Pack], $9.99
https://www.ebay.com/itm/PUMA-Men-0...customid=143171dcd3ce11ebb11d728b6ce44b6a0INT
PUMA Men's Athletic Boxer Briefs [3 Pack], $9.99
https://www.ebay.com/itm/2843018794...customid=14e25c4ad3ce11ebb1b28e7a0d52cbc40INT
PUMA Men's Sportstyle Boxer Briefs [3 Pack], $9.99
https://www.ebay.com/itm/2843018792...customid=15ab5640d3ce11eb8478f614d5ddb5b20INT
PUMA Men's Training Boxer Briefs [3 Pack], $9.99
https://www.ebay.com/itm/PUMA-Men-0...customid=143171dcd3ce11ebb11d728b6ce44b6a0INT
PUMA Men's Athletic Boxer Briefs [3 Pack], $9.99
https://www.ebay.com/itm/2843018794...customid=14e25c4ad3ce11ebb1b28e7a0d52cbc40INT
PUMA Men's Sportstyle Boxer Briefs [3 Pack], $9.99
https://www.ebay.com/itm/2843018792...customid=15ab5640d3ce11eb8478f614d5ddb5b20INT