These hotels are too expensive. But I'm wondering: if you're going to Da Lat, why would you stay in a hotel? There are so many more affordable options in the area.
First, there's homestays. These are great for families who want to get out of the city for a bit and don't mind having someone else cook for them. You can even find places where you can get help making your own food, or just rent the house itself and have your own cooking space while sharing meals with other guests.
Then there are hostels and guesthouses. These are also great options if you're looking for something cheap and they're often cheaper than a hotel room! If you want some privacy but don't want to spend a fortune on a private room, this could be just what you need.
Finally, there are campgrounds near Da Lat that offer cabins or tents for rent (at least during certain times of year). These may be a little more expensive than some options right off the bat because they require transportation costs (or renting an RV), but it's worth investigating.