List of collar makers (usually martingales):
www.2houndsdesign.com
GreyhoundMagnets.com
www.majesticcollars.com
www.aroundthehounds.com
http://www.centralarkansaspetsitting...tomcollars.htm
www.my-shops.net
www.pacific-rain.com
www.dogdayz.ca
www.asplashofcollar.com
community.webshots.com/user/nharlow
www.collarsandstuff.com
www.greenmtdogcollars.com
stores.ebay.com/Perfect-Pet-Collars
www.hurricanehoundesigns.com
www.classicollars.com
www.hotcoats4coolhounds.com
www.stylewithoscar.com
stores.ebay.ca/Greyhound-Collars-and-Coats
community.webshots.com/user/nancybnj
www.stores.ebay.com/fitforaknight
www.ifitbarks.com
www.houndstown.com
http://www.community.webshots.com/us...dlenosecollars
www.kerrykollars.com
www.LongDogLeather.com
acreaturecomfort.com/houseofearl.htm
www.vnaughtmats.com
www.needlenoseapparel.com
(taken from GT's list of member merchants - http://forum.greytalk.com/index.php?showtopic=48958)

Cleaning collars is very simple. This advice comes directly from the maker of Giselle's collars: Simply toss the collars into an empty pillowcase and set the washing machine on delicates. Air dry the collars and, voila, they're nice and clean!