Just had my DNS-323 delivered and needed to find some drives. After some time online I came across this.  Best Buy had 1TB WD WD10000CSRTL for $74.99.  Staples has a "price guarantee" to match prices.  Staples is closer to me & I just so happened to get a 15% off coupon in my email box the other day.  So after the price match ( Staples price $99.99, price match Best Buy brings it to $74.99) then taking the 15% ($11.25) off the final price was 
$63.75.  So I got 2 for under $130!  The 15% off coupon is only good until 9/11/10 but it just all added up & made my day.  I just signed up on the forum here & look forward to finding out as much as I can about keeping my DNS-323 up & running.