For Starbucks customers: Starbuck's "Grounds for your Garden" program.

"Composting

Grounds for Your Garden, introduced in 1995, provides interested customers with complimentary five-pound (2.27-kilogram) bags of soil-enriching coffee grounds. Where commercial composting is available, many stores are able to divert any remaining coffee grounds and food waste from the landfill as well."

http://www.starbucks.com/responsibility/environment/recycling

I don't know if it's worth it to go in an buy a cup of coffee to get the 5 lb. bag of coffee grounds but if one is already a regular customer, then it'd be a plus.

There's a locally owned coffee shop down the road from where I live. I might ask them as to what they do with there coffee grounds and filters. Maybe I could make an arrangement with them.