It looks like an erroneous listing but it may very well be fulfilled at that price. Worst case they send a single poor quality brief in an envelope for the $0.81 plus 7.95 shipping, best case they send a case of poor quality briefs for under $9. If they send anything less than the described 60 count you can dispute through amazon and eventually get a refund. Note that it's fulfilled by a third party and not sold by amazon so it uses the alternate dispute resolution process. Low risk and if the reward is worth it then proceed.
My memory of this brand would be the lowest quality "hospital" grade, less than even a Walmart brand. Maybe do a good deed and donate them to a place in need if they arrive and you don't fit them.