So before ordering one, i decided to try to make one!
found everything at the dollar store, a couple of little fan motors (AA), glue gun, some wooden skewers, and a mallard deek which I got from Ian! (thanks). Took me about 5 hours to figure it out and put it together. the fan motor isn't that powerful and for that reason the wings don't spin fast as a mojo but i think they just might spin fast enough to be able to bring a mallard in for me! Will try to take and test it this weekend. If it works then great, i will develop it more and put a powerful motor in, if it doesn't work then no regrets, it was a fun project and cost me under $10.

Ali