I posted a while ago about secondhand vouchers. People with less of an urge to travel than you and I will often sell their vouchers well below their value, particularly when they’re getting close to expiration. Technically they’re non-transferrable, but as long as you have the voucher number and the name of the person it was issued to, you shouldn’t have any trouble booking yourself a flight.
I try to update this page periodically with vouchers out there for sale on Craigslist. I like to use www.searchtempest.com to search all Craigslist postings at once. Please pursue these opportunities at your own risk, as with every transaction, there’s a chance these people could be scammers.
United vouchers at 70% of face value: http://saltlakecity.craigslist.org/tix/3209949546.html
$300 American Voucher: http://saltlakecity.craigslist.org/tix/3137937439.html