I had a coffee in Starbucks this morning, a rare event! I see that they have a basket full of sealed bags of packed ground coffee for the taking, used of course. It is free to anyone and I think it is a great incentive as I do know it is great for slugs and for plants. It is available in all their stores. This website gives great ideas on same.
http://www.ehow.com/how_2128557_use-...ds-garden.html