I see CNET has a price alert feature at http://reviews.cnet.com/hard-drives/samsung-840-evo-750gb/4505-3186_7-35823851.html
The reviews happened last month so it's not uncommon to see about a 3 month lag from first reviews to product in stores. Of course the "I'll give 4 pints of blood for one more frame per second" gamer would not understand this.
Someone knows when this disk will be available to buy in an online store? I see it in Amazon UK, but not on US.