Is there a way to set up or buy a remote server that can listen on a port for data?

I'm doing a CTF type coding challenge involving buffer overflow. I need to execute a command on their server and then send the output through a socket.

The problem is that I can't listen for this connection on my computer since I live in a big apartment building where I am not capable of doing any port forwarding. Is there any obvious solution I'm missing here to listen for this connection (that I can control remotely)?

I'm more than willing to pay some service to do this remotely if that's a thing.

Thanks