Amazon has Monoprice HDMI Micro Male to HDMI Female port adapter for $1.99.
Free shipping with Prime or $25+ orders.
Amazon: https://amazon.com/dp/B004YXJWMG OOS
This appears identical to Monoprice 7703 despite the slightly different part number. Monoprice has 7703 also for $1.99, with free shipping on $39+ orders.
Monoprice: https://www.monoprice.c
Typically $3.49-$3.99, which is 43-50% off regular price.
On Monoprice Q&A, this is a pin-to-pin adapter, so it should support 4k at 18 Gbps speed.
Good to use with existing HDMI cables for Raspberry Pi 4 which has dual micro-HDMI ports.
Reviews on Amazon are mixed so I picked up an extra as a backup for the few times I might want to connect my RPi 4 to a monitor. You’d probably want a dedicated micro-HDMI cable if the connection is going to be long term.