Proximity sensors for PDAs ?

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In order to test a new app I'm developing, I'd like to attach a simple
proximity sensor to my pocket pc.

The purpose is to give alert when a body is within a given distance
(which I'll calibrate).

I've researched some manufacturers sites for proximity sensors, and
would like to ask:

 - Is it possible that there are dedicated sensors made for pocket pc
to purcahse (even through ebay). I mean sensors that connect to the
SD/CF slot.

- If not, which sensors I should look for(models can be cool), and
what is the best way to implement it ?

many thanks !

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