If there are secondhand apple monitors I should be looking at let me know
I can recommend the LG 23.7'' UltraFine™ 4K Monitor for Mac](https://www.lg.com/uk/monitors/lg-24MD4KL), it’s a great one cable solution, charges, has fantastic sound and the volume/brightness buttons on your mac work with it. It’s over your budget but comes up on eBay for reasonable amounts.. You could probably make an offer on this for instance…
I can recommend the LG 23.7'' UltraFine™ 4K Monitor for Mac](https://www.lg.com/uk/monitors/lg-24MD4KL), it’s a great one cable solution, charges, has fantastic sound and the volume/brightness buttons on your mac work with it. It’s over your budget but comes up on eBay for reasonable amounts.. You could probably make an offer on this for instance…