Here's a link for the rivets I used. Very inexpensive.

https://www.amazon.com/Tandy-Leather-Gunmetal-Plated-1371-13/dp/B004C6NS48/

And if you happen to not be handy with a metal lathe, this is a typical leather hole punch:

https://www.amazon.com/General-Tools-72-Leather-Punch/dp/B00004T7WS/

You can probably buy both of these items for less than the cost of having a cobbler take care of the issue for you.