actually fuchs-shop.com is cheaper for the DS18B20:

its EUR 1.90 per piece
and EUR 1.62 per piece if you buy more than 10

http://www.fuchs-shop.com/de/shop/5/1/13372095/

If you want to save money - thats what I was assuming from your question 
- than you have to buy the bare chips.
For me this IS a sensor! And for me this IS inexpensive!

Cheers,

Martin


On 09/26/2012 07:48 AM, Markus Gaugusch wrote:
> If you just need cheap DS18S20 sensors, you might also try www.pollin.de
> They are about EUR 2.50 (but you need to solder the cable).
>
> hth,
> Markus
>
> On Sep 25, Chris Green<[email protected]>  wrote:
>
>> On Tue, Sep 25, 2012 at 08:07:26PM +0200, Martin Patzak (GMX) wrote:
>>> On 09/25/2012 06:33 PM, Chris Green wrote:
>>>> I'm looking to expand my one-wire based monitoring system which current
>>>> tells me the temperatures on our boat.  I want to add some battery
>>>> voltage monitoring, *maybe* current monitoring and, ideally, a water
>>>> (i.e. flood) detection sensor.
>>>>
>>>> Can anyone recommend a supplier for reasonably priced sensors for
>>>> voltage etc.?
>>>>
>>>
>>> depends where you live. I get mine from http://www.fuchs-shop.com/
>>> They deliver the whole of Europe!
>>>
>> I'm in the UK so could use them.  However they're very expensive sensors
>> they sell, two or three would cost as much as my whole system did so
>> far!  My temperature sensors came from Sheepwalk electronics:-
>>
>>     http://www.sheepwalkelectronics.co.uk/products-modules.shtml
>>
>> ... much, much cheaper.
>>
>>
>

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