A FlyerTalk member found this deal and posted it at
http://www.flyertalk.com/forum/southwest-airlines-rapid-rewards/1596739-hot-deal-50-swa-voucher-14-25-a.html
Post 14 seems to clear up most doubt that the offer is real. Since it must be costing the company serious money, I believe the quantity will be limited. I expect it to run out Wednesday morning.
http://www.flyertalk.com/forum/southwest-airlines-rapid-rewards/1596739-hot-deal-50-swa-voucher-14-25-a.html
Post 14 seems to clear up most doubt that the offer is real. Since it must be costing the company serious money, I believe the quantity will be limited. I expect it to run out Wednesday morning.