Motul 5W 40 - Where to buy?

[711white]

I am about to do my first oil change on my new to me Boxster. After reading many threads on which oil to use I have decided to use Motul 5W 40 Excess providing a can find a reliable place to purchase this oil. I have checked my local parts stores and they do no carry this brand of oil. Can someone recomend a online store that gives customers a great price on this oil. I found this oil on MotorSpot racing gear for $44.50 for a 5 liter jug. Free shipping if I spend $100. My second and third choine will be Castrol Syntec and then Pennziol Platinum 5W 40. Any help would be appreciated!