I know the title sounds weird but these are not used underwear. The Goodwill locations near me have a section of stuff that they buy from Target at discounted prices to resell. One of the stores I go to has a HUGE bin of new boys/girls and men/women underwear that came from packages that were ripped open in the store. They are usually priced at only 99¢ a pair and its a great way to save some money on new underwear. I got all these for Kyle the other day (most were 99¢ but a couple were $1.99).
Target sells the Hanes boxer briefs (5-pack) like the ones I got for $10.99, the Fruit of the Loom boxer briefs (5-pack) for $10.49 and the Hanes boy plaid boxers sell for $8.99 per 3-pack. That gives me a savings of about 50%.