I have used spent Coffee Grounds on my Vegetable Garden and Potted Fruit Trees for some time now and have found the practice to be very successful. They are also most beneficial to add to the compost heap.
I find Starbucks only too happy to give them to me and I am sure you would find a coffee shop in your area only too willing to save them for you. It saves them having to dispose of them.
This is a site that will give a little information, though there are many sites on the Web that will help you to see the value of this often thrown out and wasted item that some think of as rubbish http://extension.oregonstate.edu/lane/sites/default/files/documents...
Do you compost first or compost-in-situ? I have done the former, they compost down into beautiful fluffy humus. People say they are acid, none of my tests show that. Neutral more like. What have others found on the pH of coffee grounds?
How do you deal with the quantities from a coffee shop? Even my local Michel's would produce more waste than I could cope with.
I add 25% Coffee Grounds to my pots, into which I have added 75% of combined Compost or a mix of Compost & Soil. I add soil to my compost so my compost is usually enough.
You are right the Coffee Grounds are usually Neutral.
I have a big 60Ltr bin that I keep them in. I also add it to my compost in between each layer of materials. It does not go off with age, so just keep collecting until you need to use it. I promise you that you will be pleased you did. Perhaps you could provide your supplier with a bin or some type of container to put it into for you, save them a bit of work.
I'm a firm believer in the coffee grinds. I usually put them in the compost but I know you can just sprinkle them onto the beds. You should also do your tea bags in the same way.