I would say, just don't limit yourself to one nursery. Choose three recommended nurseries and get quotes from all. And use the lowest bids to negotiate a lower bid with others if you need to. Or ask if they have smaller stock and be willing to wait for it to grow in. Some places will also rebate the cost of installation if you purchase all the material at their nursery. You might ask Weston Nurseries, although they are usually pretty expensive for plant materials.