At AliExpress Garas sells an interesting powerbank with excellent price.
What we know
The model boasts a compact size (77.3 × 23.4 × 38.6 mm) and a special magnetic connector to which the cable or microUSB, Type-C and Lightning connectors are connected. The battery capacity is 2600 mAh. The case of the device is made of plastic. It has a button to switch the charge to the input and output as well as a light indicator.
Only $12.50 is asked for this model. You can choose between black or white colors.