Jailbreak iOS 8.3 is become much harder as Apple has made lots of security fixed in iOS 8.3 release. Apple also has patched an Jailbreak exploit according to renowned Jailbreak developer @Musclenerd. He also advised all jailbreakers to avoid iOS 8.3 update. You can check the complete security fixes list on iOS 8.3 here.
Jailbreak iOS 8.3 by TaiG or Pangu
They still seems out of league. Only a less hope on them about Jailbreak iOS 8.3. But we personally believe that is any known exploit is patched up on iOS 8.3, then someone can easily use that exploit to create a jailbreak for iOS 8.2 because there’s no point of preserving that exploit.
Scam iOS 8.3 jailbreak sites
There are lots of scam website about iOS 8.3 jailbreak. The real jailbreak will release by an professional for Free. There are no iOS 8.3 jailbreak tools yet out there. Simply run away if somebody asks for payment for jailbreak iOS 8.3.