Good source for folding Strida clones?
From your comments, it sounds like you're hoping to find a folding bike that folds up fast, but is also light enough to carry up stairs easily and small enough to fit through turnstiles and on the train with no problems.  All for well under $1000.

This may be impossible.  There are cheap folding bikes (under $500) and there are lightweight ones that fold up small and easy to walk around with. You might be able to find something that meets all those criteria for cheap that's used, but I don't think you can manage that with a new bike.

There is the A-Bike which is quite similar looking, but has a different folding mechanism.

There's plenty of competition for folding bikes out there:


Dahon Curve D3 $599, 16" wheels like Strida, 25 pounds, 10-15 second fold time
Dahon Eco 3 $379, 20" wheels, 26.7 pounds, 10-15 second fold time
http://www.brompton.co.uk/page.asp?p=3060 -- but all above your named price point.  There are some Pre-Owned Bromptons for just barely under $1000.
Bike Friday has a bunch of options, but all above the $1000 price point your comment mentions.  The super fast folder is this one: http://community.bikefriday.com/node/6301, $1300, 5 second fold time.


The big problem with any bicycle with such small wheels is that the ride is going to be rough and it'll be easier for the wheel to get caught on something instead of rolling over it; most compensate with wider wheels and tires which should help eliminate some of the roughness. Depending on the folding mechanism there's potentially structural (strength) problems with folding bicycles, though many compensate for those with additional material and instead make the bike heavier.

Personally, I'd see if there was someplace I could give some folding bicycles a test ride. I'd be likely to go with something with 20" wheels instead of 16", too.  16" does fold up smaller, but 20" is pretty close and should be a much nicer ride.