Earthscapes in Loveland. Extensive list, many natives, but also cultivars and "foreign" stuff.

On the east side Kassners has a nice selection. On the west side White Oak Garden center, and Holscher & Hackman come to mind.

Lakeside Nursery a few miles north of I-275 on Rt 27.
Various Natrop locations.
Delhi Garden Centers.
Bern's Garden Center on the south side of Middletown
Marvin's Organic Gardens between Lebanon and Mason of Rt 42
As previously mentioned - Earthscapes.
And I hear the old Loveland Greenhouse is being revitalized by one of their old employees so I'm anxious to see that new operation.
I'm not sure if Ammon Wholesale Nursery(doing retail sales) down in Burlington, KY is still in business or not. Use to be an OK place for plant material.
And I'm sure there's others

Correction - Lakeside Nursery is on Rt. 127 north of I-275 - Hamilton Ave or something similar to that

mrgpag, could you be thinking of Lakeview Nursery? or did they change their name? I haven't been there in a couple years since I moved near Oxford but it's a great place to get a good variety of plants/shrubs/trees...
Mary

Mary - Thanks for the correction - won't be long and I'll have right LOL

Yes - I drive down there from Dayton couple times a year - nice selections and very helpful folks. And if you're wanting something sorta special or unique - they can usually get it for you as they bring in material from numerous sources and several times a year.