Funny, my father directs a chorus around here. ^_^ Anyway, onto your question:
Live365.com has a barbershop station. You can buy tapes and CDs from harmonymarketplace.com and the male and female BBS organizations have audio and video clips on their sites: spebsqsa.org and sweetadelineintl.org respectively (yes, they both sell CDs and tapes too.) Can you tell I'm a lover of barbershop too? ;)
Hope this helps!