Research firm IHS reports that the iPad mini costs at least $188 to build, after its teardown of a Wi-Fi-only 16GB mini. Adding additional memory increases the cost only slightly while adding a fair amount of profit — an additional $90 in profit for the 32GB model, and $162 for the 64GB model. It’s important to bear in mind that this teardown only includes cost of materials; manufacturing, labor, research and development, and any other expenses…