Last night I did my first gig using Phase and wanted to transport the device in a case as apposed to the original packaging or just wrapped up loosely in my bag.
I looked around my place looking for what options I had on hand and noticed a case I had purchased to use to transport external hard drives. It was the Tech Gear Travel Case for Cords and Chargers from Tough Tested. It is not a total hard case but with a small piece of bubble wrap it seemed to work just fun and had plenty of room to also hold the RCAs and USB cables.
While there may be a lot of other options for cases to use for the Phase, this seemed to do the job for me.