On the us market, for an actual, Heckler & Koch made and imported HK91, between $3000 - $4000. You can buy a PTR91 clone, which is made with 922r compliant, US made parts, for between $1000 -...
It was primarily tested in Germany, with some trials conducted by the US Army both in Germany and the United States. The G11 project has long been shelved.