$150 from Apple. Brand new iPhone 8 is $600.

You can presumably get a non-OEM replacement for less, but you can also get a used iPhone 8 with original glass for less than $600.

> used iPhone 8 with original glass

Except you would have no way to verify if the glass is original until you take it to Apple and they refuse to service it.

Yea it's going to vary by the phone, iPhone 8 was very common and is still relatively new. In my case it was a Nexus 6p with an actual LCD problem so I needed the full assembly (couldn't find just the LCD). Lowest I could find was $250 to do it myself, and if I took it somewhere, they wanted $400 for the parts and labor, not entirely unreasonable from what I could tell since they also gave a 60 day warranty on the parts. I ended up getting a new phone for $799 instead.

Someone I know dropped a new Samsung phone and it was $600 to fix.

Yep, Samsung list the prices: https://www.samsung.com/au/support/screen-replacements/

Unfortunately I then called Samsung support and was told because I hadn't bought the "Australian model".

Nevermind that there's only one glass/screen/digitiser combo worldwide for the S8+.

$250 in Australia

For the part only or the part and labour?

Sorry for the late reply - part and labour from the official Apple store. Although prices can be as low as $30 for non-genuine ones. Obviously screen will be easier to crack if you don't take care of it but damn it's way cheaper.