I'm wondering where I can get an assortment of the most common barrel connectors used on AC adapters in a configuration that's easy to hook up to my bench power supply (connectors with leads already attached?). I work with a lot of small gadgets that are all powered with wall warts and it would be nice to have a selection of these connectors, but all the assortments I find on Amazon seem to be adapters for use with laptops which convert one type to another type, not something designed to wire yourself to a power source. If anyone knows where I can get a kit like this I would really appreciate it!