Aullwood Audubon Center and Farm in Englewood, Ohio.
You can pre-order from a nice variety of perennial plants but pre-orders need to be in by 4/10 aka tomorrow. The public sale is Saturday, April 14, 2012 from 10am to 4:30pm at Aullwood Farm, 9101 Frederick Oike, Dayton, Ohio 45414. There will also be rescued wildflowers and hypertufas available.
There is aullways (sic) aull sorts of other fun going on at Aullwood Audubon Center and Farm and I really encourage you to explore them. You can find Aullwood on the web at http://web4.audubon.org/local/sanctuary/aullwood/