one vendor on amazon has exofficio boxer briefs for less than 20 bux, black is cheapest. wool would be better, but $$$ Also, patagonia and rei brands are close to the exes.
wash them in the shower if you travel, just keep them out of hot water or the elastic will give up. wash in the cold water that comes first while you're waiting for the hot water. bar soap works fine.
Quate, Crepa, Rota