What's the unreliability about, distance, or do they fall-out?
You may consider buying on eBay some cheap wired cameras, you get them
as from 30 dollars, and sometimes even an Infra Red and/or Bullitcam
version, there is only a small chance that they will be worse than the
x10 XCAM2; mind you I am not dissatisfied with them as it is WYPIWYG.
The only thing that is an advantage of the x10 cams is the wireless
part; I may buy a couple of them from you if you price them well and
when I understand that's the issue with them.
I modified an XCAM2 connecting a good bullit-cam to the x10
transmitter and taking the camera part out. You can do the other way
around also: take a look at the many sites that connect or host stuff
of Ido Bartana. Yahoo: Ido Bartana Modification x10.