Here is a list of links where you can get detailing supplies online.
Many of these I have personally used or perused their sites. if you have any vendors you would like to add, put them in this thread or PM me so that I can add them to the list.

Zaino: www.zainobros.com
Klasse: www.klassedirect.com
Pinnacle: www.pinnaclewax.com
Meguiar's: www.meguiars.com
Mothers: www.mothers.com
Eagle One: www.eagleone.com
Poorboy's: www.poorboysworld.com
ClearKote: www.clearkote.com


Vendors

Classic Motoring Accessories: www.properautocare.com
Top of the Line: www.topoftheline.com
Griot's Garage: www.griotsgarage.com
Autogeek: www.autogeek.net
Avalon Racing: www.avalonracing.net
Premium Auto Care: www.premiumautocare.com
Autopia: www.autopia-carcare.com
Car Care Online: www.carcareonline.com
Auto Body Depot: www.autobodydepot.com
Superior Products: http://superiorproducts.com/
Danase: http://www.danase.com/store/
Winner's Circle Detailing Products: http://winnerscircledetailingproducts.com/about.asp
Shining Monkey: http://www.shiningmonkey.com/


Sanders/Buffers

Coastal Tool: www.coastaltool.com
International Tool: www.internationaltool.com
Lowe's: www.lowes.com
Tool Warehouse: www.toolwarehouse.net


Microfiber Towels:

NeatItems: www.neatitems.com
YoSteve: www.yosteve.com
PakShak: www.pakshak.com
Excel Detail: www.exceldetail.com


Detailing Forums
Autopia: www.autopia.org
DetailCity: www.detailcity.com
Show Car Garage: www.showcargarage.com
Meguiar's Online: www.meguiarsonline.com
Better Car Care: http://www.bettercarcare.com

 

Here is another Vendor:

Detailers' Paradise: http://www.detailersparadise.com


trust me, they take care of you! exemplary customer service and deals.

 

Winner's Circle Detailing Products: http://www.wcdetail.com/candypress/scripts/

 

Goodspeed Motoring: http://www.goodspeedmotoring.com/

 

Downtown Auto Spa (Vancouver, BC): http://www.downtownautospa.com

 

For us Canucks we can order from www.eshine.ca

They carry a good variety of Klasse, Poorboy, Meguires, etc... Also plenty of microfiber and other stuffs. They always have some items on sale too.

I just got a big box of toys from them. Their Ultimate Microfiber towels have a nice thick pile(ie. fluffy), they are easily the nicest ones I have.

Quick shipping (trackable) by courier, auto email of the tracking info when it ships. They reply to emails quickly and with good product knowledge.

CM

 

My new favorite site since I have been bitten by the detailing bug is Detailed Image.

They have a very extensive line of products for most any budget and carry the good products you can't find locally like Blackfire, Chemical Guys, Poorboy's World, and my favorite Menzerna. They also carry the Porter Cable 7424 and the Flex XC 3401 VRG along with the pads and accessories for them.

They also have a great detailing forum Detail University with lots of How-To's from professional detailers that I've learned tons from.

 

www.properautocare.com

 

Two other sites you can check out are http://www.adamspolishes.com/ and http://www.detailedimage.com/ . Both offer great customer service. Detailed image offers a huge selection of products.

 

www.osym.ca has $3 microfiber towels. They are tag-less too to prevent scratching. Seems to only carry one product (16x16 microfiber towel), but it's amazingly cheap compared to other vendors. I got a few, good vendor!

 

The most important thing is not that it is the cheapest place to get supplies, but that you are getting a great product. There are a lot of detailing products out there that do no good, or can harm the finish of your car. Always do a lot of research when buying a new product.

 

www.Sportwing.com

 

I'm a member of these great forums.

www.detailingbliss.com
www.live2detail.com
www.truthindetailing.com

I buy my detailing stuff from three vendors:

www.detailersdomain.com (New Jersey)
www.detailedimage.com (New York)
www.autowerkesexclusive.com (Canada)