I snagged a used "like new" one off eBay last year simply for the price $50 - it was compatible to all there 2MP cams. I typically buy the CMIP3132-28 as it has the same feature set and support for memory cards as well as the mic and should you ever want to move it somewhere that doesn't have the overhead clearance you can as well as you gain IR support - even if minimal its still more then you have with the 7122