This price isn't all that special.
www.9mart.com has been selling extenders @ 2 for $9 (free shipping) for a long time.
+1 on 9mart...they took a few weeks but they state that.
Dealxtreme is good too...I have ordered things from them in the past.
+1 for 9mart. shipping is ok speed. just order ahead of time. i have a bunch stocked up in case i expand.