Anything from 22" and larger will be fine. For sale are these fully functional, refurbished LCD flatscreen monitors. Available in 15", 17", 19", 20", 22", 23", 24" sizes and supplied with an HDMI adapter.
eBay
Universal installation bracket for computer LCD monitor all-in-one pc wall mounted bracket buckle bracket desktop stand
Aliexpress UK
The base is included by default. Gross Weight 4.02 ± 0.5 kg (8.86 ± 1.10 lb.). Net Weight 2.97 ± 0.5 kg (6.55 ± 1.10 lb.). With stand: 539.5 mm × 425.6 mm × 174.6 mm (21.24" × 16.76" × 6.87"). Without stand: 539.5 mm × 320.9 mm × 37.6 mm (21.24" × 12.63" × 1.48").
eBay
20° tiltable TV Wall Mount Bracket 360° Rotated Holder Universal TV Mount for 14 to 37 Inch Computer LCD LED Monitor Tablet PC
Aliexpress UK
All units aretechnician-tested and fully functional, with no faults and no dead pixels. Includes: UK power lead and appropriate display cable – ready to plug and play!
eBay
Gaming Monitor 7 Inch FHD Touch Potable Monitor 1920x1080 IPS Raspberry Pi Orange Pi Pocket PC Monitor Wisecoco LCD Monitor
Aliexpress UK
Its adaptive-sync technology and flicker-free technology with blue light reducer provide a comfortable viewing experience, making it ideal for long gaming sessions. The monitor also features a tiltable design and is wall-mountable for customizable viewing options.
eBay
13.3/11.6/10.1inch Portable Monitor 1366X768 Extension LCD display PC Monitor for CCTV camera raspberry ps4 switch Xbox TV
Aliexpress UK
ALL MONITORS HAVE VGA CONNECTION, IF THERE ARE ANY OTHER CONNECTIONS THIS IS A BONUS. - 1x 22" monitor. There may be marks / scuffs on the body but it will not effect the performance of the screen.
eBay
5 Inch USB-C Secondary Scree IPS 800x480 LCD Computer Hardware Monitor No Need AIDA64 Display with Aluminum Alloy Case
Aliexpress UK
Please Select the Size from Drop Down Menu.
eBay
Waveshare 7 inch HDMI LCD (H) Computer Monitor 1024*600 IPS Capacitive Touch Screen Supports Raspberry Pi Jetson Nano Win10 etc
Aliexpress UK
Cheap Gaming, Office, Laptop screens. Monitors are used but very good condition.
eBay
TURZX 8 Inch USB Portable Display IPS Type-C Secondary Screen 1280*800 LCD Desktop Extend Monitor Support TF Card Play
Aliexpress UK
☆Ports: VGA, BNC, USB, HDMI, AV input, DC 12V. 1 x BNC Cable. 1 x AV Cable. ☆This product has 4 kinds of input mode (HDMI, VGA, AV1, AV2), or a cable connection, press the AV1 / AV2 button, Switching input mode and a corresponding mode.
eBay
4.3 5.0 5.5 7.0 8.0 10.1inch IPS Capacitive Touch LCD Display Monitor LCD Screen PC Secondary Screen 1024x600 for Raspberry Pi5
Aliexpress UK