Showground is fine and cheap with power. Two toilet/shower blocks.
If I remember correctly it's on a turn off to the right before you hit the main part of town coming from Lismore.
Small caravan park close to town is OK but a bit crowded with permanent campers.
Souvenir/Information shop on the left as you enter town has a free map of campsites.
I believe there are a couple of places for Vanpackers/Backpackers and another site out of town.
Hope that helps
Cheers,
Ramblegambol