As @vcka said, there are some rooms that are naturally around $200 based on market pricing that you could get without using a dedicated rental. But I think you’re asking about reduced price / sales on dedicated rentals. The biggest savings come from expensive room categories for longer stays. If you are looking for a single night in a Studio, there will probably be no sales. I would just rent direct.
However, if you want to watch the Dedicated Rentals, check out this post here where I list four of the major players that I watched when I was looking for (and found!) a stay at the Poly for my trip in October. It was a pretty good deal (though a bit more than $200/night. 
)