Instead of trading with you, as I do not have any, I will give you some advice on how to get some:

First, you could make a diamond mineshaft and hope to find a cave.

Second, you could make a spawning room.

To do this, dig out a 9x9x4 room three layers above bedrock. You do not need to light it up, but you should, as to keep out monsters. It doesnt matter if you do or not.

If the room doesnt spawn any slimes, then it isnt in a suitable chunk. Only certain chunks will ever spawn slimes.

Just build another room a few blocks away, and eventually you will start to spawn your own slimeballs!

Hope this helps.