I have a gun case for my ocarinas. They work really well since they are similar in shape and the cases have great padding. Here’s one just like mine.
https://www.amazon.com/MTM-Single-Handgun-6-Inch-Revolver/dp/B000H8ZWYE/ref=mp_s_a_1_4?ie=UTF8&qid=1547326120&sr=8-4&pi=AC_SX236_SY340_QL65&keywords=gun+case+pistol&dpPl=1&dpID=41iOkSpsm9L&ref=plSrch