hi which country are you from in the usa you can buy jewelry saw blades I am not sure but I believe that mikesworkshop sels tham
some tips i found on the web
Always wear eye protection when drilling, cutting, or sanding brass.
The clear packing tape lubricates the blade, but make sure to tape over the entire cutting surface for greater stability.
The edges of brass are sharp and will cut your hands; wrap all edges in tape.
You can double the life of your blade by creating a higher working surface to take advantage of the blade's unused portion.
Turn corners slowly to avoid catching the brass and lifting it off the table.
Be aware of the heat that is generated quickly when cutting and sanding brass.
Don't try to cut brass without the backer board. As you cut, the blade is creating burrs on the backside.
This not only impedes the movement of the piece as you work, but will also scratch up your table.