How much to fix ipad charging port?

We cannot answer that question since we cannot see your iPad and run diagnostics. You can make an appointment at the Genius Bar. They can tell you.

Genius Bar Reservation and Apple Support Options - Apple

For practical purposes, in lieu of repairing and returning your own iPad, Apple usually exchange the iPad for a renewed/refurbished iPad of the same model and specification. The cost of the exchange is the same as would otherwise be charged for repair. Unless you have benefit of an active AppleCare plan, an out-of-warranty repair while expensive will be somewhat less than the cost of a replacement iPad.

As for out-of-warranty repair costs, Apple offers a fixed-price price repair. You can verify eligibility and cost for your region/country here:

iPad Repair & Service - Apple Support

If you have an active AppleCare+ plan, the cost of repair is reduced to a small excess/deductible fee.

Disformiscool99 wrote:

Aria (Opera’s AI) Says it’s $99 (without tax). Is Aria true?

As I said before, we do not know the cost. The Genius Bar link I provided has a chat option. Maybe you can get an answer that way.