Note that this is ONLY for Airport-City (and return if so), this cannot be used for City-Airport.
Not a bad price for a single or 2 person airtrain one-way or return ticket.
Cheaper than the normal online site's pricing regardless of how long until you need it, if even a $1 or $2, would add up if you make multiple trips on the airtrain.
If you have 3 or more people in a group then you would be better off using this.
Must use them by August 17, 2015
•Purchase unlimited vouchers
•No bookings required; please present voucher at ticket counter at terminal
•Must present printed voucher upon redemption at airport ticket counters
•Voucher can only be redeemed at airport ticket counters
•Valid only for travel from Brisbane Airport stations into Brisbane City stations between Fortitude Valley, Central Station, Roma Street Station and South Brisbane
Thanks OP. Flying to Brisbane in a few weeks time.