Where can I find a nursery with #10 native trees?
I am sure that these garden centers in the area would be able to help you, and would carry a selection of native trees:
Meadowbrook Farm - 215-887-5900
Terrain - 610-459-2400
Primex Garden Center - 215-887-7500
Tree the Streets (Native Container Trees) - 610-532-6827
Redbud Native Plant Nursery - 610-358-4300 or 610-358-3300
If you are looking for which trees might be best for your specific property or garden, you might also want to speak with staff at Longwood Gardens or Scott Arboretum of Morris Arboretum for suggestions and advice. I hope this helps.