GOLDEN GRAVEL needed for Pixies Wildlife Rescue (Blackpool FY1)

As a Wildlife Rescue we have many birds that often need to have the run of the garden. We have just released 5 ducks, after having them over 3 months. In that time, imagine how much poo they do and it all needs picking up to keep the place clean etc. In doing so, handfuls of gravel are picked up and thrown away with the poo too. Sorry about the detail but I'm just explaining. Any amount gifted to the rescue would be much appreciated. We can pick up most days/evenings.