Just go at "The Source" if you're in canada, or RadioShack in the states and buy solder there. It's not that important. Just be carefull when soldering back. As you don't know what kind of solder to use, I can only assume that you are not experienced in soldering.
You have any electronics repair shops in your area? If so, might as well bring it to them to resolder that point. Might charge you $10 - $20, but that's what you'll pay, and even more, to buy a soldering iron, solder, and flux.
Please press the thanks if I have helped you. :cool2: