Reply to Midi Fighter Pro Beatmasher

I am very keen to buy the Midi Fighter Pro Beatmasher.
However it is powered by USB.
I am running a 15" Macbook Pro.
Both USB ports are being used.
One by an Audio 4 DJ and the other by my VCI-100.
I am happy with these but really want to introduce the Beatmasher Midi Fighter Pro.
Any advice appreciated.