Power plug on back of Mini, need info

The plug on the back of the mini for the power jack.. It's kind of unique. If I wanted to build my own power cord for this thing, where would I buy one of those plugs? I want to run my Mini off a cigarette lighter jack in my car.. I have a dell laptop power supply that plugs into the cigarette lighter jack. It puts out plenty of power for my mini, correct voltage too. I just need to adapt the plug on the end of it to plug into my mini. I do NOT want to run an inverter.

I guess your best bet it so get it from the mini power cord and make some modifications to it.

I had considered cutting my cord up.. I'd prefer not to though.