It was exciting times.
My first was:
KGuard CA104-H02
It was a very low-end 4-camera DVR that came with 4 analog bullet cameras and 50ft coax + power cables.
$239.99 on Dec 14, 2010 from newegg.com
Here is one of few surviving full resolution snapshots.
Late 2011, I began phasing them out for "Ubiquiti AirCam" which was a mostly plastic 1280x720 camera with no infrared support. It was a revolutionary leap in image quality for me though.
Then in 2012 I started experimenting with no-name Chinese IP cameras that drastically outperformed the AirCam, both day and night. But those each had silly problems like frequent video corruption or really bad lenses with terrible uncorrected IR focus shift.
At some point I began using
Blue Iris to aggregate all the video into one place and record it.
Then Hikvision DS-2CD2032-I bullets (3MP / 1080p) and similar cameras came soon after.
Based on my snapshot archive, by the end of 2013 I was no longer using the analog bullet cams.