I really like Sky Nursery. It's way up Aurora, but worth the drive for their selection of plants, gardening supplies, and the knowledgeable staff. If you get on their physical mailing list, they send out a great newsletter, often with coupons.
They also have handy free information sheets on how to care for the different types of plants that they carry. If you're looking for native plants, they have a great selection.
Visit their website here: http://www.skynursery.com
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