A-R wrote:Best deal for what you need is likely a used LEO trade in S&W K-frame .38 special with 4-inch barrel from JGSales.com in Arizona. Models 10, 19, 64 etc. Under $300 for a quality used gun. Many have bobbed hammer, which turns off some folks, but should not bother your purposes of learning to fire double action for qualification purposes.
I was scrolling down with my reply in mind and when I came across this response I no longer needed to type my answer out.