Was it 2 minds whether to post it due to the FB like requriements, and the relatively unheard of company. But a deal is a deal and I guess you could always use a dummy FB account. BuyBuyBox.com have the excellent Sony RX100 for $522.23 inc shipping. The next best price is $538 without a FB like from EGlobal.
Edit- Just edited the price as its dropped to $522.23 from $525.23.
Overview-
The pocket-sized DSC-RX100 is the world's first¹ 1.0 type CMOS sensor (13.2 x 8.8mm) with a resolution of 20.2 effective megapixels and F1.8 Carl Zeiss Vario-Sonnar T* 3.6x optical zoom lens. It's the key to beautiful, detail-packed images and Full HD movie clips with very low noise.
Awesome camera, I got mine recently for around 540 delivered from Camera Paradise with a coupon code (can't remember what it was but I just googled it)