The Heckler & Koch P9S, a double action version of the rarer P9, has a large range of values in today's market. A well worn 9x19mm model, typically formerly used in police service, can fetch a price of $500-$600. Those in good condition with originally accessories typically sell for $800-$900.
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The Heckler & Koch P9S semiautomatic pistol chambered in .45 ACP is quite a bit rarer than its 9x19mm counterpart, and can easily fetch $1,000 to $2,000 on the open market in good condition.