For those camping on the cheap, here are some great campsites we found near Barranyi (North Island) National Park, NT.
#9 Beside Small Creek
Northern Territory Get directions- ✓ Free
 - ✓ Caravans
 - ✓ Camper Trailers
 
#7 Kangaroo Creek
Wollogorang Rd, Calvert, Northern Territory Get directions- ✓ Pets Allowed
 - ✓ Free
 - ✓ Camper Trailers
 - ✓ 4WD Trails
 - ✓ Allows fires
 
#6 Ryans Bend
Ryans Bend, McArthur, Northern Territory Get directions- ✓ Pets Allowed
 - ✓ Free
 - ✓ Camper Trailers
 - ✓ Fishing
 
#5 Robinson River Crossing
Savanah Way 100km East Borroloola, Northern Territory Get directions- ✓ Pets Allowed
 - ✓ Free
 - ✓ Caravans
 - ✓ Camper Trailers
 - ✓ Water (Non Drinking)
 - ✓ Fishing
 
#4 Robinson River/ Kangaroo Creek
Carpentaria Hwy, Calvert, Northern Territory Get directions- ✓ Pets Allowed
 - ✓ Free
 - ✓ Camper Trailers
 - ✓ Water (Non Drinking)
 - ✓ 4WD Trails
 - ✓ Allows fires
 
#3 Hidden Billabong
78 Kms out of. Borroloola On Savannah Way, Northern Territory Get directions- ✓ Free
 - ✓ Caravans
 - ✓ Camper Trailers
 
#2 Foelshe River
Wollogorang Rd, McArthur, Northern Territory Get directions- ✓ Pets Allowed
 - ✓ Free
 - ✓ Caravans
 - ✓ Camper Trailers
 - ✓ Fishing