Sales like this Amazon one may be spurring rapid growth in Blu-Ray sales.  In the first half of 2009, sales are up 91% compared to a year earlier.  According to the Digital Entertainment Group, sales of Blu-Ray and digital downloads are keeping digital media afloat.   Compared to last year consumer spending on pre-recorded media is down 3.9%, and net profits have fallen 2.2%.  The growth in high-margin products like Blu-Ray and digital downloads have helped keep the bottom line from sinking too rapidly, as Blu-Ray’s 91% growth means $407 million in sales and digital distribution grew to $968 million.  Rentals, too, increased in the first half of this year, up 8.3%.