In Oregon, no other municipality can add sales taxes on top of the state rate.
Special Rules for Oregon:
The 2017 Oregon Legislature passed House Bill 2017, which included a new bicycle excise tax. The Oregon bicycle excise tax is a flat tax of $15, to be collected at the point of sale. Revenue from the bicycle excise tax goes into the Connect Oregon Fund to provide grants for bicycle and pedestrian transportation projects.
Follow this link to the Oregon Department of Revenue for more information.