The Simpsons Seasons 1-9 for $34.34 each at play4me dvd
This special doesn't include the special edition boxed sets.
EDIT - It's actually cheaper if you are buying two or more - as you get free delivery automatically (no code needed), and can use the 10% code as well. E.g. adding two to your basket makes it $32.35 per series!!! (Plus cashback!)