I recently bought 2x Qihan Technology Qihan QH-NV470SO-P IP cameras, for outdoor use.
For the price, around 70 EUR / 100 USD each, I’m very happy.
Picture quality is good. Night vision (with IR LED’s) is good too.
No microphone built in as far as I can tell.
Unfortunately the web interface is quite outdated, and requires Internet Explorer (ActiveX) or Safari…
Luckily I only used that for initial configuration.
Default IP address: 192.168.1.10/24
Default username/password: admin/(blank)
Default RTSP (TCP/554) url: rtsp://192.168.1.10/tcp_live/ch00_00 for full resolution / high quality, ch00_01 for lower quality.