$300 cam for green screen?!

Umm, okay. I worked with the HVX for a few years and the GH2 last year and loved them both. I started a freelance gig today and I'll start with some green screen interview footage that they're shooting. Their last video guy had brought in a DSLR, but I don't have a camera body right now since I sold my Canon to switch over to m43rds soon. Their pay is low for even just my time, certainly too low for me to invest in new equipment for this job. So, they are purchasing a consumer camera today that will be used for both green screen and web cam recordings. Can anyone suggest a model that would be best for trying to pull green screen keys with, with a budget of $300?