Adding to what DrDrew stated, Ithaca made about 450000 Ithaca doubles, 237000 Lefever Nitro Specials, and 65000 Western Arms Long Range Doubles.
They made eleven Sousa Special/$1000 Grade NID models, but I've never seen a number on how many Flues Sousa Specials were built. The retail list price of a NID Sousa Special started out at $750 in 1926, with the price to dealer of $625. By 1936 it was $812.50 and $687.50. By the Fall 1937 Ithaca Retail Catalogue it had become the $1000 Grade. I don't have Dealer Prices for 1937, but by 1938 it was $847.46. In January 1946 it was still the $1000 Grade at $1029 and $906.44 Dealer price. By July 1, 1946, it has become the $1500 Grade with a list price of $1587.14 and a Dealer Price of $1190.65. By November 15, 1946, it is the $1700 Grade and the list price is $1745.85 with a Dealers Price of $1309.72.