The one of Chinese smartphone product is available on the Chinese market, thats the Mlais MX58. Interestingly, this phone has 5 Inch full HD screen and powered by quad-core chipset but offers with very affordable price.
The Mlais MX58 has $180 USD price tag, but this phone has high-end specs, compete with another high-end smartphone on the market. As we mentioned before, this phone is packs with 5 inch screen size and support for 1080p full HD display, while the screen is coated with Gorilla Glass.
The Mlais MX58 is powered by MediaTek MT6589 processor and sports with 1GB of RAM and 4GB of internal storage while the user can upgrade the storage through microSD slot up to 64GB. There is also 12 megapixel rear camera with f2/2 aperture and 35mm lense for rear facing camera, and 2 megapixel of front facing camera.
Mlais MX58 is running Android 4.2 Jelly Bean operating system and powered by 2500 mAh battery capacity.[source]
It may be very difficult to find ROMs and support for unpopular devices. Despite the cheaper price, you should be careful unless you don't need support and ROMs. Custom ROMs definitely will not be available. But, you cannot even find official ROM!