go to deepdiscountdvd.com
use the 20% off promo code: SUMMERSALE
expires jun 25 (thats tomorrow)

they have motogp and world superbike dvds for under $19 normally. toss in free shipping and 20% and youve got one hell of a deal. and yes, theyre reputable. i've order from there a couple times now. much better than paying over $30 at duke.