Inexpensive, Programmable, IP-Based Camera

I'm looking for something specific for an application where we need a lot of cameras and need to trigger snaps and grabs against external events. (Yes, I know there are a zillion machine vision applications/products and I'm familiar with many of them, but the application doesn't justify the expense.)

Does anyone know of something like this:

- IP-based. Either ethernet or wifi, but preferably not GigE because the infrastructure isn't there

- Preferably has pan/tilt and/or zoom capabilities

- Can be controlled *automatically* via network communications. (I.E. web services, udp, snmp, etc.) Please note, I'm not talking about built-in web servers where you can go and configure the settings of the camera. I want something where I can send it a network "trigger" when I want the picture/video. Much like an electronic "external trigger" on fancier cameras. A standard camera that comes with a "Developers kit" may be good enough.

- Of course, as inexpensive as possible

Thanks in advance.

Mike