Try this website http://www.fsguns.com/used/?action=list&bindx=6&action=list&cindx=1 it will give you prices for several models pricing for this brand and caliber.
50-550 usd
50-350 usd
S&W has not used 19a as a model designation.
250 or so
250-500 USD
100-300 USD
300 USD
100-440 USD
100-300 or so
50-500 usd
$650-$1000 used
Not recommended