I have a very specific business need for delivering 5V USB power to an array of identical high power devices.
I've spent a lot on USB hubs. But all have died for one reason or the other.
It would be helpful to know what you're trying to connect -- per device load, tolerance to supply voltage regulation, uptime criticality...?
You can buy ultra-cheap switchmode supplies off eBay all day long but my money would be on industrial-grade equipment with names like Allen-Bradley or Lambda. For example, this:http://www.ebay.com/itm/Nemic-Lambda-EW ... 19d74df078
For the 30A current you need, you would want to connect an AWG #8 copper conductor from the supply output over to a fairly hefty terminal block and then tap your discrete circuits from there. Unless you have time and patience to dig through industrial supply catalogs or the electrical aisle at Home Depot, a car audio shop will be your best bet for sourcing cable and distribution blocks with the correct ratings.
Keep in mind you can start a fire with this project unless you know how to size and assemble wires and terminations at the correct current ratings.