Hopefully, someone from that location will have some specific answers. In the meantime, I'd look in the Yellow Pages under 'mulch or compost '; I'd also call a landscaping company or two and ask if there's a local source of bulk compost. Many municipalities have a compost pile and make it available to residents....so you might try calling your city's services division.

This is assuming that you need a lot of compost. Good luck!