I'm wondering where people purchase their data center / server room components from. In particular, I'm looking to install an Emergency Power Off switch in our server room and have been looking for a supplier that sells those kinds of components, but have not been meeting much success.
http://www.stayonline.com/ has some cool datacenter stuff..
Your electrician will probably want to help you select one that's appropriate for your environment, just like you would prefer that a client or business ask you before they purchase a whole load of servers or rack hardware. Bonus: The electrician will have wholesale pricing that is not available to you, so the total cost will probably be lower.
For other purposes, we mostly use APC or find a local reseller. The local resellers usually can get better pricing than going through the manufacturer.