http://www.maxim-ic.com/auto_info.cfm
MAXIM also sents free samples
http://www.fuchs-shop.com/
http://www.spezial.com/
http://www.1-wire.de/
http://www.reichelt.de/
1-Wire offers are less, but otherwise...
http://www.homechip.com/catalog/
http://www.aagelectronica.com/aag/index.html
http://www.hobby-boards.com/catalog/main_page.php
http://www.tme.eu/de/