I got the blade inserts from Honda. Worth about $7 each, much cheaper than buying whole blade assemblies for $28 each. But replacing the blade inserts was one of the more difficult things I have done for the car. But I strictly followed the owner's manual's instructions. Some say you can simplify the removal and re-insertintg by just leaving the blade assemblies on the wiper arms and sliding out the inserts from the far tips of the blades.
Sorry for a Prius owner butting in here, but isn't that the way inserts are usually changed - on any wiper blade?