Oh, the irony - the rule of thumb when playing with a computer is never have a magnet come anywhere near it due to the fact that it can easily erase your hard drive and leave you crying in a corner, but now look! It's a computer on a magnet! Er, well, maybe a few website boxes and arrows, but still! Now if we could only find a justifiable (they're kind of pricey) means of using these things...
Sets (41 magnets) are available for €20
(about $30). However, buying 5 sets for €90
(about $180). Savings much? Not really, but if you've got lots of money and the need to stimulate creativity through magnets on your company fridge, go nuts!