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2.3 stopped months ago. 4.0 is the current min (more like 4.2).

Entry-level Android phones running 2.3 are sadly still common:

The Galaxy Ace range is pretty popular here, too.

There are also a slew of super-cheap chinese phones which come with 2.3 -- check out aliexpress.

The first 3 Samsung phones you list were all released 2-3 years ago. The last 2 were both released over a year ago (Jan / Apr 2013).

They're not new models being release with the old OS.