Friday isn’t just iPhone 5 preorder day — it’s also the first day that Amazon’s (AMZN) brand new Kindle Fire HD tablet goes on sale. The 8.9-inch version of the sleek new slate won’t be available until next month, but the 7-inch model can now be purchased on Amazon’s website for just $199. The new Kindle Fire HD features a 1,280 x 800-pixel high-definition display, Dolby audio, a 1.2GHz dual-core processor, a front-facing HD webcam and access to Amazon’s Prime library of streaming movies and TV shows. The non-HD model of Amazon’s Kindle Fire is also available starting Friday for just $159.