I’m Eligible for the upgrade 30% discount on the upgrade program, but the full surround sound set has stock all sold out, that I want. How long does it keep my 30% discount on the sonos website, as I don't want to purchase the items separately, I’m happy to wait for the stock to show again.  Also I’m eligible for two product upgrades, does mean I can order the full surround sound set and say a pair of play 5. Thank you for help Andrew