bought ipad at flea market its locked to prior owners account and no way to reach prior owner, whayt now?

I'm afraid that there is nothing more you can do.

You purchased a used iOS device with Activation Lock.

This a a security and privacy feature.

If you cannot contact this iPad’s original owner, you now have a dead, useless device to you.

No one here can help you.

No one from Apple will help you, either.

You are stuck with a dead, electronic paperweight/serving tray.

Tap and read this user tip from one of our regular, contributing volunteer users here below.

The All Too Common SAD Reality of Buying … - Apple Community

Nothing you can do. Perfect Example that you should only buy new devices from the Apple Store or from Autorized Resellers.