David Brahms/Specialty Enclosure Designs/The Reptile perch offers exactly that on his website up to 4' long.
In my larger enclosures I just use tree stakes from Lowe's and cut to length. Wrapped in hemp twine and silk vines.
Link to an older thread of mine detailing my setups including these pvc perches
https://ball-pythons.net/forums/show...nd-Accessories