Links:
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The Brompton of folding bikes: www.brompton.com/

The Bentley of small-wheel bikes: www.moultonbicycles.co.uk/models.html

The American company that will make your lifetime companion: www.bikefriday.com/folding-bikes/product/bike-friday-pakit-compact-folding-bike

A durable commuter:
​dahon.com/bikes/speed-p8/

Another durable commuter: usa.dahon.com/bikes/mariner-d8-2/

​A great starter folder: usa.dahon.com/bikes/boardwalk-d7-classic/

One from Giant:
​www.giant-bicycles.com/int/halfway