what is the best web site or web sites to buy scion aftermarket stuff from?

There are hundreds... depends on what you are looking for. Do you want Toyota products? Do you want some serious power adders? Do you want some cheap generic stuff?

Here's a start with some Toyota dealers, the second one has some nice JDM stuff.

http://www.trdsparks.com
http://www.newscionparts.com/

Sparks Toyota is the best for factory accessories. I went to the local tuner shop for a stripe 5 1/2" for the entire top of the car otherwise it wouldn't fit well on the groves on top of the car.
I wish the xB had the aftermarket accessories like a Mini Cooper.

thanks for the info...

http://www.hopupracing.com/scion.html

bbist.com

For some of the basic stuff....

cardomain.com
summitracing.com
lastlookcustoms.com
oznium.com

what i tell everyone though ... check the classifieds on the 3 top Scion sites.

SL
NRG
& ClubxB

what is the best web site or web sites to buy scion aftermarket stuff from?

Do yourself a favor and check out the different dealers in the Buyer/Seller experiences section. That will give you a good idea who you can count on.

Ken