Repair garage door chain
Yes what you are looking for is a "Master Link" - they are available from places like Grainger, ACE hardware, Home Depot, Bicycle Shops, even amazon.

I looked at your pic - enlarged it - and noticed you had a Genie Pro - I did a search for the following. 
The prices though might break your candy machine money..so you will need to skip the soda and snickers bar for a day.
Somewhere under $4.00  ..

Genie Pro Chain Master Link

Moving Up Garage Door Company. 

Garage Door Supply Company