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If you've not brazed before you'd be best doing some research as to the most suitable type of rod for your situation. What equipment will you be using? And what part of the bike?
DIY stores (B&Q etc) usually stock flux coated silver solder or bronze brazing rods if you only want small quantities.
Otherwise you're probably best going to a framebuilders supply place such as Ceeway. (http://www.framebuilding.com/)
I have a full fabrication workshop at work,with everything I made need.I have mig welded the damage on the frame and ground it back smooth,apart from a couple on spots and thought about just running a touch of bronze rod and flux into it and then of to the powder coaters.
Orange 71,I did notice those and have found some silver rods in my garage,which would work,other than no flux.....