Price cut on Nikon DSLRs.till when?

I want to buy a Nikon D3100 w/ 18-55 VR lens from Walmart,
there's a price cut on every website (amazon, walmart, best buy and Target… Etc)
in amazon it was $649 and now $449 and on Walmart and other sites it was $549 and know $449
well there's a price cut about $100 so is this permanent?
if not when will the offer expire?
because I'm planing to buy it in June from Walmart or best buy
links
http://www.amazon.com/...003ZYF3LO/
http://www.bestbuy.com/...Id=1222817
http://www.walmart.com/...o/15222286
http://www.target.com/...A-13042842

The price drop is do to the D3100 being discontinued. Sellers want to get rid of old stock. Once they're gone, they're gone.

Nikon often gives instant rebates on discontinued gear to get them out of inventory. The rebates rarely last more than a month or two.

From what I have seen, the current rebates end on June 1. Whether or not they will be extended is anyone's guess.