Espenak recommends that people stick to the AAS's approved list of 12 companies that manufacture and/or sell eclipse glasses and handheld solar viewers, which have been verified by an accredited testing laboratory to meet the ISO 12312-2 global safety standard.
McDonald's locations in OR are on NASA and the American Astronomical Society's list of certified retailers of eclipse glasses, which allow you to safely watch the solar eclipse on August 21.
Retail chains listed include 7-Eleven, Best Buy, Kroger, Lowe's, and Walmart, among others. As the eclipse date draws closer, those glasses are getting harder to find.
Many online sellers are third-party vendors on Amazon, but higher prices and extended shipping dates, some beyond the August 21 eclipse date, are being reported, according to Business Insider. Glasses that are scratched or more than 3 years old also are not recommended.
Safe viewing glasses are available free to the public at the Centennial Library and the Downtown Library, 301 W. Missouri Ave., Midland.