If you have a local wine shop you should be able to buy packs of dried berries which gives you the opportunity of making the wine out of season. I have tried these and have had an excellent result. You would use 8oz dried elderberries as opposed to 2lb fresh.
ElderFLOWER wine and elderBERRY wine are 2 completely different things - the former makes white wine from the flowers when they are white and beautiful and fragrant in early summer, the latter makes a red wine from the berries when they are dark purple and juicy in late summer/early autumn depending on the weather. You can certainly get dried ones from specialist home-brew shops - these are now few and far between but lots of them do mail-order so a bit of Googling should enable you to track some down.
Many thanks for all your answers, Greymalkin, if you read this will you give me your recipe for elderberry wine that you used the dried elderberrys in please, thanks.