Immigration
https://www.fijihighcom.com/consular/visa-services-permits-waivers
Australians
http://smartraveller.gov.au/Countries/pacific/Pages/fiji.aspx
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4 months visa free, 2 extra months for a fee
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$160AUD Single Entry Visa (SEV) for 3 months
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$217AUD Multiple Entry Visa (MEV) for 12 months, 4 months each visit