Low cost image sensor

Hi,
I have been searching the web for a low cost image sensor.
The application is for reading a type of barcode, approximately 20mm x
5mm, but I could make do with an area as small as 10mm x 3mm. A
resolution of 0.1mm would be more than adequate, and I only require
monochrome. Ideally I would like no moving parts, and no lens. The item
to be scanned would be placed directly on the sensor, illuminated from
behind.

I have found something like the VV6501C001 from STMicroelectronics,
cheap enough for this application <$6 US, however the array size is 3.6
x 2.7 mm, and the resolution is much higher than I need, although this
is not a problem. Unfortunately the physical package does not allow
these to be stacked in a linear array, or else I could use 3 or four of
these type of devices.

Any suggestions would be appreciated, for this to be cost effective, we
are looking at a maximum of $20US in small quantities.
Thanks,
Allenb

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