There are cheaper options than this, but mind: Those aren't completely trivial devices. They have to negotiate to get more than 100mA(?) and for that negotiatio

There are cheaper options than this, but mind: Those aren't completely trivial devices. They have to negotiate to get more than 100mA(?) and for that negotiation there are two protocols: Apple's and, I think, Samsung's, (which is used by everybody in the Android world nowadays) And the negotiation has to involve both, the supply and the device. Cheap devices sometimes only negotiate with the device and then draw too much electricity out of the supply, which can be damaging.