Bill your right about planning ahead, especially important is to map it all out before you get something. Also you can do much of the same yourself with a little work and a few seperate parts.
Look at the sites Bill suggested, for a more DIY approach check out
Waytek Wire : Electrical Wiring Supplies & Industrial Products they have loads of things that will help get your electrical set up. Not too much in the way of complete assembley like you have but should give you a good idea what is components are available. Don't know if they do intl shipping but useful for some ideas of what might be available.
Sandy