[OSGeo-Discuss] Cost of satellite images for the past 20 years

[maning sambale]

Hi,

We say that the cost of using satellite imagery was greatly reduced
compared to a few decades ago.  We are doing some literature review on
the cost of satellite images in the past 20 years (particularly SPOT
and LANDSAT).  Any pointers on where can I get hold of old price list
of these data.  A few hours of searching doesn't yield good results so
far.

cheers,
maning

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