As Markoasis said, all local JD should be selling matchday tickets/vouchers.
Mind you I'm not sure about them selling shirts, as has been said, that just takes a nice fat profit away from the Latics shop.
On 2nd thoughts however, making access to tickets/vouchers easier is a priority and seeing as profit would be made by Latics from JD selling tickets/vouchers and increasing our fanbase, Latics could allow JD to sell and make the profit on the shirts in exchange for them selling tickets.
BTW Corney has said on LW that 2 keen replacements have taken over from Gorrill who would welcomed any marketing suggestions. Doesn't help that Gorrill's email address is still on the Latics site's contact list page though, the Clubs Officials page is more helpful though, think I'll try Commercial Executive: Richard Taylor.