I'm sure you could get them at McMaster Carr in whatever size and length you need. Trouble is they only sell them by the bagful.
Cutting a bolt and cleaning up the threads will be a fussy job, especially on a bolt that small. You would need magnifiers to see what you were doing. Putting a nut on first might help, it would make it easier to clamp the bolt for cutting. Personally I would use a dremel to do the cutting rather than a saw. Cut it 1/8 over length with the dremel then use a flat on the Dremel again to shorten it down and maybe get rid of burrs, shortening it with a dremel would give a smoother end than a file. If you don't have a dremel you would need a very fine saw and file to do something that small.
And by the way, if you don't have a dremel - WHAT'S THE MATTER WITH YOU MAN. Actually you can get a low power cordless quite cheap on Amazon and once you get one you will find a thousand uses for it.
Cutting a bolt and cleaning up the threads will be a fussy job, especially on a bolt that small. You would need magnifiers to see what you were doing. Putting a nut on first might help, it would make it easier to clamp the bolt for cutting. Personally I would use a dremel to do the cutting rather than a saw. Cut it 1/8 over length with the dremel then use a flat on the Dremel again to shorten it down and maybe get rid of burrs, shortening it with a dremel would give a smoother end than a file. If you don't have a dremel you would need a very fine saw and file to do something that small.
And by the way, if you don't have a dremel - WHAT'S THE MATTER WITH YOU MAN. Actually you can get a low power cordless quite cheap on Amazon and once you get one you will find a thousand uses for it.