I just figured this out! Go to your World Market (the ship/dock where you can purchase goods with game money), click on anything for sale (you don't actually have to buy the item), and when that user's sale screen opens, click "visit" next to their screen name. That should take you to their island. Find their egg basket, click on it, and drag jellybeans onto it. You can only leave one jellybean per visit in a six hour span, so you'll have to go to different places to get rid of a bunch. Little time consuming, but worth it to free up storage space.