Not meaning to not add to the conversation here, but make sure you're careful when using magnetic tips. You're extremely unlikely to harm your computer with it, but don't make blatantly obvious mistakes like poking the hard disk continuously with the magnet .
As for the kit, I'm not having much luck. I picked a kit of tools for comp maintenance from my local computer repair shop. If there's something like that around give it a try.
I use a regular magnetic tipped driver for most screws, but I have an opticians small set for laptop work, I passed the normal one over the smaller ones I use and it magnetised them so I don't drop laptop screws everywhere,
Most hardware stores sell phillips head drivers, both magnetic and non_magnetic