Finding a jailbreakable iPhone or iPad might be difficult since the jailbreak community usually lags behind Apple firmware.New devices will not work for jailbreaks since they usually have newer firmware pre-installed from higher inventory turnaround rates.To find jailbreakable devices, used markets might be better since the likelihood of finding an old sale (NOS) device is also possible.You need to figure out which device and firmware combination you are aiming for since knowing what you want will help you narrow your search.People can look in places like eBay, Swappa or Facebook Marketplace.Sellers can lie on the firmware of their device when they sell it online so be cautious and try to avoid this scenario.The battery may have already been used for about a year before it starts dying.Be aware that the market can be competitive when it comes to these devices.When a new jailbreak comes out, markets dry up as a lot of people anticipate jailbreaking so it's best to be prepared and buy ahead of time.It is advisable to have a separate secondary device for jailbreaking and at the same time keep your current one for updates and new features.