#35 chain ( additional ) can be purchased at any Small Engine repair facility. This is the major form of power transmission used on lawn and garden equipment.
One of the largest in Michigan is Weingartz Supply. I am sure that there are others, just "let your fingers do the walking thru the yellow pages" - hey that would be a good jingle
it might be worth money some day.
The chain breaker is available at "Tool Stores" or in catalogs that sell small engine tools. "Northern Hydraulics" is a good source. They are also available at many other tool retailers, "Performance Tool" a low cost retailer is but one.
Search the web using "Chain Breaker" as the search. I am sure you will come up with sources.