The ARRL just opened up the process for obtaining a certificate for the Centennial QSO Points Challenge Award, as well as the W1AW WAS certificate or plaque.  Go here: https://centennial-qp.arrl.org/index.php  Use your LotW username/password to log on, and click on the “Centennial Points Challenge Award” or “W1AW/WAS Award” tabs along the top.

The certificates are $16 each, and the plaque is $60.  The certificates looks something like this: