I know you can buy a new TX200 (MkIII) for $629. This has a suppressor (air gun nerds call it a sound moderator) and a hunerd dollar Jim Macarri Tune job including his proprietary "black tar" permanent lubricant.
It will put all shots through the same ragged hole at 10 meters. It chrono'd out about 800fps with Crosman Premiers. Theres no rubber seal to wear out, wont diesel, no maintenance except to wipe down the high lustre blued exterior.
This is no kids toy or a Chinese pellet gun either. Its made in jolly olde England and weighs over 9 lbs without scope, your kid better be in good shape if you want him to use this because the "cocking effort" is considerable.
$600 FTF west of DFW, scope not included (requires a special scope rated for air gun recoil), shipping is not included either.
Cash price is firm, may work a deal on a trade however plus or minus cash as always. Remington 700 or 788 in 6mm? 700 in 223? Ruger MkII government model?