In general, memorabilia are available for purchase from the moment we receive their first declaration of departure (as unreleased). This can vary between 48 hours and 24 hours before the race!
As a reminder, we depend on our data provider for precise times but PMH departures seem to regularly leave at 1:07 a.m. and Premium meeting departures at 1:07 p.m. (winter time) and 2:07 a.m. and 2:07 p.m. (summer time).