Can't find prices for a jailbreak, but a zero click full chain exploit with persistence is $2.5M for Android, $2M for iPhone:
https://zerodium.com/images/zerodium_prices_mobiles.png
Seems iPhone exploits got cheaper because they're too abundant: https://twitter.com/Zerodium/status/1260541578747064326
Apple has released phones with major vulnerabilities hard-coded in the silicon. When the checkra1n jailbreak was released, the only fix was to buy a new phone because it exploited flaws in the bootrom & secure enclave silicon.
https://www.malwarebytes.com/blog/news/2019/09/new-ios-explo...