Dont expect massive price drops Nvidia have never been one for that
You're right. They're not big on huge official price drops after new cards come out. When they produce a new line of cards, they simply
stop making the old ones completely.
It is then up to the retailers to discount the old cards heavily to put them in a respectable performance/cost value position so they can get sold off. While supplies last and all. Sometimes you'll see retailers procure a batch of old cards from some warehouse or other retailer for super cheap that they think they can get rid of for a bit of a profit, but these aren't newly made cards, just ones that have been lying around before.
So yea, in the end, whether the price drops are official or not, they do happen. There is no point in Nvidia 'officially' dropping the prices of cards they dont make anymore. They let the retailers handle that situation, which is the only sensible way to go about it. The end result is still the same though - massive price drops.