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You would need to check with your local store.
Depends on the size of the bolt? , is it 3/8 or 1/2 inch and grade 5 or grade 8. It depends on how you are rigging everything , my general rule is in using either type of these bolts my opinion is the superstrut bar might fail and bend before the bolts fail. Their are so many variables in using this stuff always keep this in mind, so I always overbuild in my projects, and this stuff is not designed to hold up a lot of weight. It’s made to hold up or suspended plumbing and electrical wire in buildings from the ceilings and walls so keep that in mind when using it. Also consult technical information from the manufacture about load limits of their products or a structural engineer. It also comes in different sizes that are bigger then what Home Depot carries and you have to go to a industrial electrical , contractor supply store to find it and the price per foot is about the same.
A sawzall or a abrasive cutoff saw will make quick work of cutting unistrutt.
I usually find it in the electrical section of the store
Used galvanized bolts, washers, lock washers and nuts.