Anyone got any Bris / Gold Coast - Sydney flights late August or credit they want rid of?

As per title, booked a flexible booking hotel in Sydney for the 28th of August for a week to the 4th September.
Looking for:
Flights on those dates or can be changed to those dates for cheapish (unlikely but why not ask)
OR
Credit vouchers from airlines, not fussy which its just a flight, will need probably $300 I think but I'll buy small denominations if need be and can redeemed en masse.
Also lounge passes, point of the trip is for me and the girlfriends anniversary, so it would be nice to hang around a couple hours earlier or so enjoying the comfort and free amenities.
Sorry if this is wrong place to post, please advise if it is and I'll move it. Classifieds was only for selling I thought.