It seems Samsung 840 EVO series SSD is on sale at Amazon and Newegg.
So the prices at Amazon are:(US$)
250GB: $139.99
750GB: $359.99
1TB: $494.95
Shipping for 1 unit is US$8.59. Limit 5 per customer
According to 3 camels, those are the best prices so far. I reckon $422.56 for 750G delivered is excellent value. Local prices are over $550. $422 is by Amazon currency converter, you should do better by using 28degree card.
500GB is US$279, not the cheapest, just for reference
Edit: As foobar kindly pointed out, now 750GB is $409 delivered! Sweet!
The 250 gb turns out to be $169 AUD delivered with amazon converter, so its around $19 cheaper than Australian retailers