A few weeks back it was my birthday. I never know what to ask that is cheap enough for most people. But this time I thought of the Raspberry Pi Zero W. It's cheap, it's flexible, it's great. It even builds a wall for you. Multiple people bought one for me, and that's how I ended up with three identical Raspberry Pis.
I wanted to try out Ansible for a long time, and three Raspberry Pis is a perfect use case for this. I have created an Ansible playbook to install a LEMP server: Linux, Nginx, MySQL, and PHP (7.1). The code is freely available on GitHub so you can use it too. You can find it here:
https://github.com/michielgerritsen/ansible-lemp-for-raspberry-pi
Have fun!