I purchased a 4GB version of the RPi4-B in a Canakit with the works. It was $99. I installed Raspbian on it and was very impressed. I tried using it as a 2nd desktop for a short while, but realized the limitations of the unit. For not much more money I bought a Dell Optiplex 7020 with an i5-4790 CPU, 500 GB HDD and 4 GB DDR3 RAM. I had some parts to make it 8GB of RAM and a 2TB HDD. So, I'm now running Ubuntu 20.04 and lovin' it! The Pi4 is a fun computer to play with and could do as a desktop replacement if you had no other option. I'll be taking it to the beach next week and will hook it to the TV to check email, etc.
John