For those of you not familiar with Mariposa bikes, you may be interested in taking a look at the used 51 cm one up for sale at: http://www.bikespecialties.com/
The price of $1500 Canadian corresponds to approximately $1250 US.
This is what I consider a true example of a randonneur bike, on a par with anything built anywhere in the world, including the Paris suburbs. It comes with custom rack, fenders, lamp mounting, BB generator with remote on/off lever, braze-on center-pull brakes, vertical drop-outs... etc.
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Steven Maasland
Moorestown, NJ