What about Foscam?
The 8931 has 960 recording and the 9821 has 720 recording, both under $100. Foscam cameras are ONVIF compliant, and there are plenty of recorders on eBay and Amazon (I personally use a Dahua recorder). The cameras have SD slots as well, so depending on Resolution and whether you’re doing 24/7 recording or simply motion events, might go back a few days. It has the option for saving to FTP (or cloud) and can send notifications for motion.
Foscam cameras are PTZ as well.
For a higher resolution alternative, you can do the same with Dahua or Hikvision cameras and NVRs… I have 16 outdoor cameras recording at 3MP resolution.
To price it out for you, the camera would typically be $100, NVR $200-300 without hard drive, and a WD purple drive for 2TB for about another $100. You’d obviously have plenty of room to grow too.
The Stanalone Dahua and Hikvision cameras are also POE (power over Ethernet) so 1 Ethernet cable carries both Power and video. For POE, you’d also need a POE injector or router. The 4 Port router will be another $40-50.
The above Alternatives do not require you to incur any monthly monitoring fees either. You can typically select pretty intricate settings as to user permissions too. Another benefit is remote administration, as well as remote saving of video surveillance footage.
As you can tell, I’ve just installed a system and I’m pretty versed in the available options…