One of our allotmenters, Ausra is selling get wet used coffee ground 20 kg for €5. Used coffee grounds are a useful additive for a compost pile, and as a direct fertiliser. They are neutral ph. More info about their uses can be found online, such as here: https://www.gardeningknowhow.com/composting/ingredients/coffee-grounds-gardening.htm
If you’re interested contact Ausra by email email@example.com.