What is a realistic total budget for getting into airguns?

For a quality break barrel: $200 for the rifle, $80 for an airgun-rated scope and mounts, $30 for a tin or two of pellets, $50 for a pellet trap and targets - about $360 all-in.

For an entry PCP: $400 to $700 for the rifle, $200 to $400 for a hand pump or used SCBA tank with adapter, $150 for scope and mounts, $50 for pellets - $800 to $1,300 all-in. For CO2 or multi-pump: $150 to $300 covers everything including ammo. Plan to spend more on a chronograph ($150) once you start chasing accuracy.