Where to buy cable sleeve and heat shrink in USA


I would like to purchase some expandable cable sleeve and heat shrink for a diy cable project. Looking for a USA dealer if possible. Also, if my cables are 3/8" what size sleeving and heat shrink should I get.
Thanks in advance
lvk47
Page two of this catalog: (http://www.percyaudio.com/Catalog.pdf) Michael will also provide any necessary guidance, to ensure the best results are obtained.