It happens, there was another site selling brushless motors for $12 each. Turns out they were actually supposed to be $80 or so. They had so many orders for it in one day that they had to cancel all the orders because of the typo. I am sure they would have lost thousands if they hadn't caught it. You lucked out since the order actually processed and nobody caught it. It's not like Horizon to do that, but good that they honored the price even if it was wrong.