I have four derringers...all Davis. One in 32 ACP that I load with black powder and lead bullets, one in 38 special, and two in 22 lr. As Match Director, I often use the pair of 22's for loaners when a stage requires a derringer.
I also have four pocket pistols...nothing special one in 38 S&W 3 in 32 S&W. They were all under $100 each. I also load black powder for them.