Only season ticket holders are eligible for away games. It works on a loyalty system. Doubt anyone here, if they have a ticket for that game, will be willing to sell it on. Your best bet is twitter. With the new rules if you're caught selling your ticket there's a pretty hefty ban as well. My friend has been banned from OT for 3 years for touting last season.

Bare in mind the Vitality Stadium is tiny so there won't be many tickets going anyway.