Amazon has recently begun pimping the HD and HD-XR versions of the Roku set top box. This latest offer will give a $20 credit that can be used towards Amazon Video On Demand purchases if you buy a Roku HD or Roku HD-XR.
Price wise, the Roku HD is selling for $99.99 and the HD-XR is $129.99.
Additionally, once you purchase the Roku you will also be able to browse and watch other content such as Netflix as well as the available channels in the Roku Channel Store which includes goodies such as Pandora, Revision3, TWiT and more.
In terms of this deal, it is available for a limited time — it expires at the end of the month, on March 31.