From Wikipedia:
Although The Price Is Right became Goodson-Todman's first regularly aired game show to be broadcast in color on September 23, 1957, no color kinescopes or videotapes are known to exist from the nighttime run.
Many monochrome NBC nighttime episodes (plus at least one ABC episode) aired on Game Show Network from 1996–2000, at which time the network's contract to air the show ended; it has not been renewed since. The 1961 episode hosted by Francis aired on Buzzr on March 8, 2019 as an homage to International Women's Day; Buzzr added the program to its weekend lineup in September 2019, with its package also including episodes hosted by Merv Griffin.
Most of the daytime run is believed to be wiped; the UCLA Film and Television Archive lists the first and third episodes from 1956 among its holdings. A few NBC daytime episodes with commercials intact, originally broadcast in the late spring/early summer of 1957, have been around the "collector's circuit." They are now available for viewing on YouTube.