I wanted to buy a uCurrent, so I went to the online distributor for Europe (robot-italy) and nearly checked out the item. It was around £70 including taxes and delivery. Then decided that I will try to make one.
I would definitely buy one if it was a reasonable price like under £40 (as it is in Australia).
I spent around £15 on parts, and a good few hours.
So this is what I ended up with:
(I only made it for personal use and not for commercial use)