Prices of Oberndorf Mausers to U.S. buyers of 1939 (Stoeger catalog):

Stoeger's 'off the shelf' Mauser offerings ranged from $110 for a Model A in 7X57, 8X60, or 9X57 to $250 for a Type A 'Model 628' in .404 Jeffrey, 'Model 628A' in .280 Ross, or '628B' in .318 Westley Richards. A Zeiss or Hensoldt 4X scope could be fitted for an additional $100.

Per usinflationcalculator, that $110 would equate to $2,344.63 today and the $250 Type A would be $5,328.71 in 2022 USD. Add scope to the Type A and you're at $7,460.19