Used and refurbished F-16s are expensive right now , but price will inevitably drop as USAF starts to retire their planes . As for Mig-29 , many countries use them and it is not such logistical nightmare as some people portray it . In fact , Mig didn't made any new serial version Mig-29s excepts Mig-29Ks for India . All the rest are upgraded planes left from Soviet Union days .
Realistically , JF-17 is currently inferior to second-hand F-16 Blk52 , Mig-29 SMT or Mirage 2000-9 . Regarding the price , biggest competition would be Mig-29 SMT ($ 25-30+ million , depending on the package ) . As we saw , even Kfir Block 60 is a potential challenge . Therefore , to have a chance on international market , export JF-17 would need to stay at around $ 20 million . Anything above that and potential buyer would consider buying from proven aircraft manufacturers instead of newcomer .
Therefore , JF-17 needs to have modular design , which would allow "lite" version for export to poor countries and "full" version for PAF and potential richer buyers .