NDS lite repair? anyone have experience with it, partic. in Montreal?

My DS Lite has some issues with the right shoulder button... I'm thinking I may have to get it repaired. It works sometimes, but other times it doesn't "push" properly and it's really killing my current Mario Kart DS buzz :(((( Anyone had a problem like this before, or dealt with any sort of repair people? Who DOES repair these things, anyway? Do I have to send it away for like 6 weeks and pay liek a hundred dollars to fix my stupid R button? If I do I will trade game boys with some kid on the bus, I swear to god. I'll tell him mine can unlock the secret pokemon because I bought it in Japan or something.