Hey Pantywaist, generally the pants that make the most noise are the Polyurethane and Crystal clear pants. You can find polyurethane at most places like, Fetware http://www.fetware.com/ultra.htm
or, LL Medico
http://www.llmedico.com/g/plastic-pants/
Protex
https://www.myprotex.com/web-cart_default.asp?cat=Eurosoft+II+Vinyl++Pants
Plastic pants .com
http://www.plastic-pants.com/euroflex.htm
Crystal clear at;
B4NS
http://www.b4ns.com/index.php?PageType=GenInfo&PageContent=MaterialDescription
and you might find them at some of the others too. Here is my whole list if you want to surf through some.
http://www.angelfluff.com/
http://www.lovingcomfort.com/
http://www.myprotex.com/
http://www.babykins.com/
http://www.plastic-pants.com/
http://www.llmedico.com/home/
http://www.comcomfg.com/
http://www.fetware.com/
http://www.diaperstation.com/
http://www.drylife.co.uk/index.php
http://www.acmedi.com/acms/