Wow - a teener in Saudi Arabia.
Shipping of a Monza muffler will not be cheap. Those are pretty heavy. Username
@MB911 makes some great stainless steel mufflers to forever end muffler rust through.
You can likely patch what you have. As you probably know, it will be a temporary solution. Best case is find someone good at TIG welding and they can patch it and it will hold you for a couple years until it rusts out somewhere else.
I had a Monza that was heavily patched and repaired before it had to be junked. Just recently obtained a set of used, really rusty 914/6 pipes that needed a new collector transition fabricated for use as test pipes. TIG welded it up OK but it won't last forever until the next rust through.