I'm in Australia, and I wasn't too sure how to get a decent Amiga monitor.
Within a short while of thinking about this, I found an old TV on the side of the road which had a UK power plug and SCART input on the back.
I grabbed it, and took it home, and using the RGB->SCART cable that I'd bought in anticipation, I plugged it in and it works great!
That cable was called "Amiga RGB Video / Audio SCART Cable (1 Meter)" which I got from an eBay seller (https://www.ebay.com.au/usr/ikonsgr74) from Greece for about US $15 delivered.
The TV I found was a Sony Bravia KDL-26S3000.
It's a 26" 1366 x 768 TV.
It's the only SCART monitor I've tried and it worked great.
So that is just an example of what could work for you. But bare in mind, I have an Australian Amiga, and it's a UK TV, and both are PAL regions. So that may not work so well for US / NTSC residents.
I had also bought an "Amiga RGB to VGA" adapter (https://amigakit.amiga.store/product_info.php?products_id=183) but none of the monitors I've tried it with support the required 15 kHz input. I've tried searching on eBay for lots of the monitors on the list of 15 kHz monitors, but they're either really expensive, or none turn up. (I do still hope to maybe just stumble across one in a thrift store one day, though!).
So for me, I stumbled onto a SCART TV, and it just worked with the cable I bought.
Thought these tales might help someone.
A little addendum about PAL - it's the standard for the signal from the aerial and separates the audio and the video signal. Different PAL regions separate the two by differing frequencies.
However, SCART puts the RGB signal in after the tuner (on old CRT TV's it would put them right onto the gun) so accepts the RGB as it is.