Updated May 10 at 12:33 PM This is the week that supply surged past the backlog of demand for COVID-19 vaccines in Portland. The metro area had seen the highest vaccine demand in the state. Now Portland, like much of Oregon, is seeing a lot of doses remaining available, so many that the wait for a shot has completely evaporated. Appointments are no longer required. Walk-ins for vaccinations are now welcome at the Oregon Convention Center, the largest vaccination site in the state, as well as the Portland International Airport drive-thru site, run by Oregon Health & Science University. And there are walk-in appointments now at least at some drugstores, including Walmart.