Crafting questions about and also how to obtain items.

Have some questions regarding crafting.

Having a hard time locating metal hair combs to decorate. Do you know where to locate them?
When fabricating bracelets (ie. beaded) what is the best stretchy substance to use and is there such a thing as a stretchy wire substance?
What can be used to coat or treat copper so that it doesn't tarnish when made into jewelry?
Does anyone know "in general" how to locate bulk items for (eg. collars or leashes) decorating?

Thanks for any helpful information. ~~~ Carol