Stone Bros & Byrd is a great local garden center, recommended to me when I first moved to Durham. I've never ordered anything via the web site, but I stop by there about once a month or so during growing season. Prices aren't low, but there's a much better variety of healthy plants (including natives) than at the big box stores. Folks there know their stuff, but are busy so have limited patience with naifs who haven't done due diligence and ask boneheaded questions. Ask them a GOOD question, and you'll get a great answer.