What to get the Grove that has everything?
Indo-European cultures placed great importance on the notion of Hospitality, on the idea of a Gift for a Gift.  Often GOSH is asked, "What can I bring?" 
So we've put together this list of things that are always welcome.
Ritual Goods
Tea lights        Sandalwood incense
Olive oil          Honey
Wine              Bread
Flowers          Grains/Birdseed
Unscented pillar candles

Food or drink to share with the folk is always welcome and appreciated as well.  And, as an ADF Grove, any monetary donations are tax deductable; just ask the Treasurer for a receipt.