I've known this information for a little while, and I think I should share it with the rest of you.
Whenever Toys R Us had that "Buy 3 power disc packs for $6" deal, I mentioned something along the lines of "I hope I don't get too many doubles," and an employee heard me. She told me that Toys r Us would probably be hosting a trade event sometime after Christmas, and if I had any doubles, I could trade them then.
Now, she didn't provide me with any documents or ads saying this, so I'm not 100% sure about this, but just in case anyone is wondering if there will be another trade event, there you go.
If there's anyone here that works at TrU and could confirm this, that would be great.