You can download it for free.
I don't think this project would be good enough to sell on the UE4 marketplace but I might have another project good enough someday.
This game is based on this video series from my YouTube Channel. This does not show everything in this game but it is very similar.
However, this requires a C++ project so probably not a good project for beginners.
UE4 - Team TPS C++ #1 Player Character & Bot Team Setup