weight sensor

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Does anyone know where I can get an low cost weight sensor? I have looked
and looked and looked but can't find one anywhere. I know they exist since I
can buy a digital bathroom scale for under $20 usa and the bathroom scale
has 4 sensors (strain gages) built into it.  Unfortunately a strain gage
requires some kind of signal amplification that is beyond my limited
abilities to assemble.




What I would like to find is a component that has the strain gage and the
signal amplification all build into it. The load would be in the 20 - 90 lbs
range.



thanks in advance to any and all that reply.



Re: weight sensor



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Digital fishing scales?  To make a 1 off is gonna cost loads . When you make
100K off  bathroom scales, the cost heads towards zero, like all
electronics.
Do you want a one off, or something you can put into production? For a one
off, rip apart the fishing scales....



Re: weight sensor



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Thanks for taking the time to reply. I want to prototype an idea I have and
if the idea truns out to be a good one then perhaps go into low volume
production. My problem is that I am a computer programmer not an electrical
engineer. So I am trying to find low cost components that I can assemble on
a bread board for a prototype.

I did find this at
http://www.alibaba.com/product-gs/205545588/Micro_weight_Style.html?pn=6&pt10%&total31%&cids10%101838,50146584,50136352,200011188,50139365,50136805,200016031,50133357,200007460,50014385,50018800,50023060,50134883,50146124,200000970,&tracelog=detailtop12907&newId20%5545910#page960

Model CZL902
===========
Rated load: 50KG
rated output: 1.0+-0.15MV/V
dimensions: 34*34*7.8(mm)
Cable spec: 0.8*420mm

To my simple non-ee mind it looks like this might be useable out of the box.
I am hoping to find one I that I can just read the voltage and then compute
the weight.

jim



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