Only one R390 road car was ever produced by Nissan as a prototype for the development of the race-cars and was never intended for sale, although Nissan did offer to build further versions at a value of US$1 million.
ˈoʊnli wˈʌn ˈɑːɹ θɹˈiːhˈʌndɹɪd nˈaɪnti ɹˈoʊd kˈɑːɹ wʌz ˈɛvɚ pɹədˈuːst baɪ nˈɪsɑːn æz ɐ pɹˈoʊɾoʊtˌaɪp fɚðə dɪvˈɛləpmənt ʌvðə ɹˈeɪskˈɑːɹz ænd wʌz nˈɛvɚɹ ɪntˈɛndᵻd fɔːɹ sˈeɪl, ɔːlðˈoʊ nˈɪsɑːn dˈɪd ˈɔfɚ tə bˈɪld fˈɜːðɚ vˈɜːʒənz æɾə vˈæljuː ʌv jˌuːˈɛs dˈɑːlɚ wˈʌn mˈɪliən.