@Saralaraloola There are actually 2 different specials for greenies. One is half off as mentioned the other is x3 the amount. I personally buy during the x3 as it is the most cost efficient. As far as, send in return, that is actually listed for every player on your list. When you look at your list and some do not have it. That just means you have already sent a gift within the last day. It can be useful but is not fool proof. The thing is if a neighbor wants something and sends it to you, you hit send in return. If you do not actually have that item in your gifting list it will replace it with a different gift. The gift sent is determined by its position on your gifting list. Imagine all the gifts are numbered. Your neighbor sends you gift 6 when you hit send in return the game returns the gift that you have in position 6. Since there are different gifting lists your gift 6 may be different fro your neighbors.