I am starting this thread to help others find a nice case for the their HDX
I own two cases:
Poetic Slimline Case for New Kindle Fire HDX 7 (2013) 7inch Tablet Black (3 Year Manufacturer Warranty From Poetic) $12.95
I love this case! It so light and thin. It adds very little bulk and it amplifies the speakers on the HDX giving it more power. It has the auto on and off sleep function. I bought two, one for $3 and one for $5 I would gladly pay $13 and Poetic does stand behind their cases.
Amazon Kindle Fire HDX 7" Zip Sleeve, Graphite (fits the all new Kindle Fire HD and HDX 7") $19.99
This is a really nice sleeve. It's very thin and small not bulky at all. The HDX fits perfectly in it. It wont fit inside if it's in a case there just isn't enough room. I got mine for $10 with voucher and it's really nice for those who read without cover. It's soft not hard though like backpack material with stiff padding inside. I'm not sure I would trust it in my purse but in a satchel like for a laptop it would be great. It will protect nicely for home use.
(I will add pics later)