I have found this fitness tracker on Tiny Deal and it seems really cheap and is getting excellent reviews online.
It has all the features of the dearer trackers and comes in under $30 delivered which I think it a really good price.
Also has up to 5 days battery life which is different to the usual daily charge of smart watches and other fitness trackers.
Here are the specs from the website.
Compatibility
Compatible with iOS 7 or above; Android 4.3 or above; Bluetooth version 4.0.
Your private management experts, help you monitor the daily movement, always check the number of steps, helping you to achieve your health goals.
IP54 water resistant
Convenient for your daily life.
Regular service 5 days
About 5 days standby time, say goodbye to charge every day.
Mood
Your mood housekeeper, always know your mood.
Blood Pressure
Intelligent monitoring blood pressure reasonable movement to better health.
Heart Rate Monitor
The custom heart rate sensor in L18 Wristband can help gauge your intensity during workouts to improve overall calorie tracking.
Sleep Monitor
Automatic identification of sleep and waking up monitoring body in a shallow and deep sleep stages.
Fatigue State
Real-time monitoring your fatigue.
Band Materials
Made of rubber, hardness is harder than ordinary rubber but more comfortable to you.
Is it known for another name? I've tried to Google/YouTube search it and can't see a trace of it out there.