Get it while it's hot - 7-inch Wi-Fi only Kindle Fire HDX is on sale for $149 at Newegg
$150 will get you a brand new, unopened device with a full year's warranty. However, you'll have to deal with Amazon ads on the lockscreen, which shouldn't be too off-putting.
Go snag the tablet from Newegg's eBay store while it's still available.
source: Newegg eBay store via Android Authority