I recently added a comment to a post about micromark, but figured I would start a thread based on these two companies, for those who haven't heard of these two, they are based in the states. Micromark is a small tool company which also sells some train items but mostly, hobby tools, they really have a lot of items. And smooth on is a company which sells two-part mixtures for molds, which are then used for making resin, plastic, or rubber parts, this stuff is great to make scratchbuilt parts, especially if you have a lot of the same part to make. Because the mold is rubberized and can be used multiple times, so if someone has not seen these sites give them a look, some pretty neat stuff.
http://www.micromark.com
http://www.smooth-on.com/
Wade