I'm a huge fan of Rickshaw Bags, primarily due to the overwhelming amount of customization options and the sturdy construction. They now have an iPad Mini sleeve available for order and if you place the order today and enter "vote2012" at checkout you will receive 20 percent off. Just ordered mine (after I spent a ridiculous amount of time deciding on the various color and material options.)
http://www.rickshawbags.com/customize/custom-bag/fabric_selection/ipad-mini
http://www.rickshawbags.com/customize/custom-bag/fabric_selection/ipad-mini