I have one of these and it just slightly went down in price. Great reviews on Amazon.
My phone have 4650mAh battery so needed something bigger to get few charges on the go.
It have two 2.4A fast charge USB ports + one Type-C and display which shows you precisely how much battery is left. My old battery doesn't hold much charge despite showing almost full (3 out of 4 led lights are on). This is much better solution.
Of course Amazon and next delivery is a bonus :)