ZeroLemon have a 10000mah solar powerbank for $9.99 using coupon code ORGTPG63 Free shipping with prime.
Link:
https://www.amazon.com/dp/B00NIOGKNQ?tag=hawk-future-20&ascsubtag=UUacUvbUpU5524303
Coupon code: ORGTPG63
Link:
https://www.amazon.com/dp/B00NIOGKNQ?tag=hawk-future-20&ascsubtag=UUacUvbUpU5524303
Coupon code: ORGTPG63