A few samples:
https://www.aliexpress.com/item/2015-New-model-DS-2CD2135F-I...
https://www.aliexpress.com/item/4MP-Dahua-H-265-IPC-HDBW4431...
Heck, even my local computer store has their own branding of a cheap camera for a quite good price:
http://www.canadacomputers.com/product_info.php?cPath=37_498...
I bought one of these recently and it seems to be a Dahua based firmware, full ONVIF support and available locally is pretty nice.
Edit: I also recommend checking out the Zoneminder wiki for suggestions. Here are some pages for Amcrest: https://wiki.zoneminder.com/Amcrest https://wiki.zoneminder.com/Amcrest_QCam
They also have a listing here: https://wiki.zoneminder.com/Hardware_Compatibility_List#Netw...
AFAIK, you don't technically have to keep it connected to their service.