Yes you can. You can find them on ebay if you want to get a good deal on some. If you have the newer alarm system with the technicolor touchscreen and wireless sensors, there are two window and door sensors I know will work with the system. The visonic mct-320 sensors and the visonic mct-340 sensors. You probably had the long thin sensors installed which are the 340s. The 320s are also available and will work. Only difference is the 320s are a thicker and not as long. They also use larger batteries cr2 type as opposed to the watch type batteries the 340s use. Comcast can sell you more and install them but they want $50 per sensor plus install fees. You can find the 320s for like $18 on ebay and install them yourself. The 340s are a little harder to find but I've seen them on ebay for about $30 each. You can also find other stuff for the system on ebay like the motion sensors keypads and such.
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