$150
My K3 Wifi only cost me $4
July 15th: Ordered 'Refurbished' K2 for $110 USD
July 19th: K2 arrived, screen was dead on arrival
July 19th: Talk to Amazon CSR, replacement is sent!!!
July 21st: 2nd K2 arrives. It works!!!
July 21st - July 28th: Enjoying my K2 every day
July 28th: I hear news of the K3 Wifi being released for $139 USD
July 28th - August 1st: Waffle back and forth if I should 'upgrade'. Finally decide to list my K2 for sale locally.
August 1st: Sell my K2

For $150 USD making a nice $40 profit
August 1st: Pre-order K3 Wifi
August 20th: Unable to resist the temptation to sell my K3 pre-order on Ebay any longer I sell it for $260 USD!!!

A tidy profit of ~$95 USD
August 20th: Order my '4th' Kindle, another K3 Wifi for the grand total out the door pocket cost of
$3.78. Should be delivered Mid September.