There's precious little information about organist Sam Lazar, who had several albums and a bunch of singles on the Argo label from 1960-62.
According to Wikipedia, Lazar was born in St. Louis in 1933, played with Ernie Wilkins and toured with saxophonist Tab Smith before serving in the military from 1951-53.
There was a period away from music to study medical technology before Lazar, inspired by a Jimmy Smith date at a St. Louis club, took up the Hammond organ.
His first album, Space Flight (1960), featured a young Grant Green on guitar, but Green was gone from Lazar's group by the time the single Camp Meetin' (b/w I Ain't Mad at You) came out in 1962. It was issued on both the Argo and Checker labels, both imprints of Chess Records. Camp Meetin' didn't make it on to one of Lazar's albums, but you can download it from the link below.
Lazar does not appear to have recorded after his stint with Argo and the only one of his albums released in a digital format was Space Flight. It was issued on a Japanese CD that now goes for about $50. But Space Flight is also part of a 2007 Grant Green CD compilation, Organ Trio And Quartet, which can be had for less than $10.
Vinyl copies of Sam Lazar's Argo releases also approach the $50 mark.
There are several very good quality Lazar tracks available on YouTube, including this one: