I have done SEP(sea) skill tests for both Como and Biscarosse and find the both to be charming places. Very individual and quirky and I would be hard pushed to so which I prefer the most, the vote would come down to who has the better food and wine.......
And trust me €190 is cheap for seaplane flying, I have paid twice as much at other places. Its not cheap, think of the cost of an aircraft to maintain and then add in the floats and the effect of water and you will see where the prices come from.