For a cheap kit, that's not bad however most of us on this forum tend to steer people away from the ebay kits. They generally aren't the greatest quality and include a lot of generic knock-off parts or no-name parts which basically means you have zero quality control. It may be fine or it may give you lots of issues. It's hit or miss. $800 should get you a decent turbo and MAYBE a log mani. A whole kit for $800, I'd be sketched.
Plus, it says you still need to purchase a downpipe and don't forget about the ECU, fuel injectors, pressure regulator and other tuning items that you want to do on turbocharged motors. That's another $500+ so add that into you pricing