Each sponsored flag flies at the centre and is replaced often to keep it in pristine condition. When a flag is replaced the sponsor receives it plus a certificate of authenticity. The minimum donation to receive a flag is $500.
To make a donation and be able to receive a flag that has flown at the storied Juno Beach Centre in Normandy, France you can find the link below.
There is also other ways to donate to the Centre at the site.