Hi Caitrin!
Garden supply stores should carry bamboo poles, or if you can get your hands on a tiki torch (seasonal but widely available) you can just remove the flame canister.
Some might disagree with me here, but I would personally say that theatrical fitches aren’t necessary for practicing the techniques of scenic painting; it’s more about learning to manipulate the tools you have to get your desired result. Cheap chippers from the hardware store comprise probably 60% of the brushes I use in my work, then some varied sizes of Purdy sash brushes, a random assortment of artist brushes, etc.
That said, here are a few retailers from which you can order fitches online:
Rosco
Norcostco
BMI Supply