LGTI MicroMachines made soft plastic minis of TNG-era Federation, Klingon, Romulan, Ferengi and Cardassian ships. The company went under in 1998, but they’re still availible on Ebay.
Star Fleet Battles may be somewhat ancient, but it’s most certainly still about, courtesy of Amarillo Design Bureau Inc. They produce a very extensive range of starship minis including TOS-era Federation, Klingons, Romulans, Orions, Tholians and Gorns.