This picture shows the 30 and the 40...with the differences in shaft length. If I am being honest I think I had just as much power...and better battery life...with the smaller motor. But I needed the extra shaft length.
I originally took the head off mine and extended the wiring. Put the reo stat and electronics in a box, but it was well out of warranty. Still have one.
It was perfect for the power float.
This one is smaller/lighter and appears to have a shorter shaft, but it seems lower quality and will be slower than the brand names: http://www.walmart.com/...lling-Motor/22086513
May work OK at locations you don't have to fight wind or current. Caveats, as I have NOT used this one myself.
Anyway, no shipping charge and easy returns (if not satisfied) when you have it delivered and pick it up at your local Walmart.