When Disney introduced their new Magic Your Way packages with dining addon back in January, they pulled the rug out from under the voucher sellers. HotwireSavingsClub, Connections and SimpleEscapes sold whatever inventory they had left but could not get any new ones. At this time, the only source for vouchers is thru online auctions like eBay and DISAuctions.
It's a shame because there's a whole market out there of people who do not buy packages, do not stay onsite and do not have APs. AP holders can at least buy into the Disney Dining Experience and get a discount on their meals. Disney would be wise to offer some sort of "meal package" to offsite guests. It would keep them from leaving the parks for meals and spending their vacation bucks elsewhere.