Amazon’s Kindle Fire HD models aren’t even six months old yet, but things move fast in the Android tablet world, and as even the budget-priced end of the scale sees the move to quad-core chips and A15-based designs, Amazon may be starting to feel a little pressure to make its tablets (despite their huge sales figures) just a tad more competitive. To that end, the company has a short-lived promotion on the 8.9-inch versions of the Kindle Fire HD underway, offering what amounts to 10% savings. As part of what’s being ...