uxcell Polyurethane Round Belts 5mm Dia, 3 Meters (10ft) Length PU Polyurethane Belt for Drive Transmission (Smooth Surface, Orange)

https://www.amazon.com/dp/B0D7MBCRSH?th=1 I just use this stuff and make my own belts. Less than 8 dollars for what seems like it should last awhile.