I really like the T100 Thrusters made by Blue Robotics, but I'm also cheap. My current ROV uses cheap brushless motors (A2212/13T 1000KV Brushless Motor) which cost $5 each - the T100 costs $119. But I wanted a better prop design. As it happens, Blue Robotics publish the CAD models for their thrusters, so I decided to modify them for my cheap motors.
More information can be found here: https://hackaday.io/project/18036-cheap-rov-thruster
The prop is tricky to print well. You might need to try that part on a finer resolution.