BlackBerry has been shipping their Premium Folding Blade Charger for the BlackBerry PlayBook for ages. I have confirmed with BlackBerry that the new BlackBerry Z10 is fully compatible with the premium charger and allows it to charge at 1.8A. That pumps out twice as many amps as the charger shipping with the Z10 and three times the amps of some older BlackBerry chargers. In other words you need one of these!
The best part is that the BlackBerry Premium Folding Blade charger is REDICULOUSLY cheap. You can pick one up now for ~$10.40 shipped on Amazon. Its pretty much a no brainer. $10 to charge your BlackBerry Z10 twice as fast. Let us know if you find similar deals in Canada and the UK!