Nathan Cleary, recovering from a serious leg injury, remains the leading target.
PNG reportedly offers up to $1.5 million tax-free; some estimates value him at $1.7 million.
With November 1 approaching, the PNG Chiefs still need 23 players for their inaugural Top 30 roster.
Canberra's Hudson Young deal is $4.4 million over four years; PNG's $900,000 tax-free offer was rejected as below market.
Jeremiah Nanai, 23, may test the market, with the Chiefs, Storm and Roosters linked.
Newcastle raised Bradman Best's offer from about $700,000 to $820,000 yearly; a clause could push it close to $1 million.
Parramatta wants Best long-term, while Perth is another possible destination.
Liam Martin seeks $1 million annually for three years; Cronulla, Brisbane and PNG are pursuing him.
Jack Bostock prefers the Dolphins, but their tight cap could open the door for a Dragons bid.
Cameron Munster reportedly rejected Melbourne's $750,000 annual extension and may need to accept a pay cut to stay.
Hamiso Tabuai-Fidow has a reported seven-figure Dolphins offer, though the club's salary cap is tightening.
Herbie Farnworth prioritises the Dolphins despite Roosters links; talks are on hold until after the World Cup.
Sam Walker wants a deal before November 1; the Roosters reportedly offer $1.3 million yearly.
Ratchet clauses could lift that figure to $1.5 million by 2031, which PNG can match tax-free.