Check out: http://www.jcwhitney.com/ I just ordered two 10" red tubes. $15 each and free shipping.

 

I ordered my first set of xenon bulbs from them because it was cheaper than most places (Around $15) but there was a catch. Shipping costs were ridiculously high and it took almost 2 weeks to ship. To top it off, the lights were in very poor condition with scratches all over. Blew out after a month. Fortunately, they have a 180 day return policy, but I still ended up eating the shipping costs both ways and waited almost a month for the refund.
I'm surprised to hear that there's free shipping...
I don't know about others but I definitely wouldn't recomend them too anyone.....

 

Wow.. well.. we'll see what happens. I'll let you guys know if my order gets screwed up.