If you want to save money, you have to spend time and energy surfing the Internet, such as 365 Renting Network and 58 Renting Network in the same city. And search for the news of the landlord yourself. But from the experience, there are many intermediaries lurking inside, which should be carefully screened.
Personally, I think it's very cheap to live in Huang Jiawei, the central gate, or near Zhonghua Gate, Nanjing South Road. The prices in these two places are low, but the rooms are old, that's all.
If you are a young man and want to have some spare time, it is not bad to share a street on Zhujiang Road, and there are many houses in the 1980s, which are not expensive.
I wish you a satisfactory house in Nanjing.