ARDUINO ETHERNET SHIELD R3 OUT OF STOCK

Hi,
I wanted to buy ARDUINO ETHERNET SHIELD R3, but it is showing out of stock from long time (almost more 2 months).
Is there any other way to order this from some other website ?
Also I am concern if this model is discontinued ? If yes, can you tell which Ethernet shield I can buy for using it with Arduino Due ?

Any information would be helpful.

Thank you.

Regards,
Swaroop