It is mixed bag about supply situation of Lumia 928 at Amazon. While White Lumia 928 is sold out at Amazon, Black color model which has been out of stock for quite long is back in stock at Amazon. Good news is that now both the colors are in stock at Radioshackwireless and for the first time at Walmart wireless too. Pricing at Radioshack is same as Amazon at $49, while Walmart has both the devices priced at $79. Though Walmart keeps changing the prices often and if you check them time and again, you can grab a good deal.
For your comfort we are providing Lumia 928 links for all three retailers.