hello there jaime,


   I have just recently bought 15 I.R. sensors for an installaition I  am working on.
   I found two for around the $5-$6 range



http://www.dealextreme.com/details.dx/sku.7330

http://www.dealextreme.com/details.dx/sku.10082

i went with the first link because it is a rabbit, of course.

shouyld get them in a week or two.

i know a bit about hackingt them(not too hard to do it seems)

let me know how this project comes along as we might end up being a valuable resource to one another.

--

Ben C.