Used Engine for Aveo – Blue Prism Automotive

Hey everyone,
I’m looking for a used engine for my 2011 Chevy Aveo, and I came across a listing from Blue Prism Automotive. They claim it's a low-mileage engine, but the price seems too good to be true. Has anyone dealt with them before? Their reviews are kinda all over the place—some people swear by them, while others say they got an engine that barely ran.
Also, they said it's been "tested," but I don’t know what that really means. Should I be worried? I don’t want to end up with a lemon (again). Any advice?

What price did they quote you and what is their shipping charge?