Do you know any shopping apps that can provide facility of shop from USA and ship to Sri Lanka?

Hello desi dime Peoples Around here, I Have A Question Hope I get Answer There.
My sister looking for solar power supplies products that she wants to buy from USA and ship into Sri Lanka. actually, she does not have much knowledge of online shopping, then she wants some expert advice from me as I am a technical eCommerce development manager in Houston, Texas. When I researched about this, I got that international shopping app like Amazon and Ubuy

provide this facility. 

Do You Ever Use These Shopping Apps?