Missing card replacement?

Hey, so awhile ago I obtained a Dreamscape Oracle deck, and a couple weeks ago I was using said deck, and realized I was missing a card. I've looked all over the place for this thing, torn the whole place apart really. It's just gone, I don't know. Does anyone have a suggestion on where I could purchase a single card for the deck, like is there an ebay or etsy shop that does such a thing? thanks for any help<3