こんなのはどうだろうか
https://www.ebay.com/itm/1x-Baton-Holder-High-Quality-Plastic-Holster-Telescopic-Case-Black-Brand-New/253821134773

https://www.ebay.com/itm/360-degrees-Baton-Holder-Plastic-Swivelling-Baton-Case-Telescopic-Holster-Black/273516125393