Bobby:
The price Monaco provided you may have been for the wiper assembly. Last I called them for a wiper arm only, I was given a price of $80ish. That was priced within the last 6 months. I bought one from beaver coach sales and was disappointed with the fit. It appeared the female receiver for the shaft was not the exact diameter and therefore did not seat completely as it should have, but so far is holding up with very little use due to RainX.
This difference in diameter is why I called Monaco and to find out who manufactured theirs and at that time I believe the gentleman told me Diesel Engineering, but I can't be real certain. Beaver Coach sales provided me one manufactured by "MAO YI" which I claim is not quite at the same diameter but will fit. When I addressed this concern they commented they have put several on and have had no complaints.
Hope this helps, Good Luck
Larry D