HI Galatic.
You dont need to be a season ticket holder etc. I live down south aswell and bought tickets for the Pompy game yesterday. Was very simple, just phoned up, gave my card number and bam! 2 tickets on thier way. Being that its now Thursday though, you may have to pay a special delivery charge as the girl said you can buy them at the ground.
Good luck getting them mate!
COYB!