Flat-panel monitor/s for disabled people (North Laine BN1)

Thank you for reading this post! Following my recent appeal for computers for disabled people (which is now ongoing after a sucessful start!) I have begun to be offered desktop PCs for which I also need screens. Please can you help ? I'm looking for flat-panels in the 19" - 24" range with VGA, HDMI or DVI input in working condition. I can collect from you. I have often found such screens in the streets but by now have given all I had away....