The best price recently has been lightning deals at Amazon, where it is offered new for something in the low $300's range. The deals only last a day max, but they have done it about once a month over the last three months.
That's the only "deal" pricing I have seen on the 436. Everyone else, including Amazon, have it at about the same price otherwise.
Amazon Lighting Deals. It usually drops to $350 and February it dropped down to $340. Just keep checking either using the Lighting Deals search. Or just keep checking the 436 page. And remember it only stays low for a few hours. In Dec it was for only 4 hours. So you have to be ready to click Buy. March has not had any Lighting deals on the 436 yet, so I expect any day now it will hit.