Pat Davis wrote:

I live in the Richmond, VA area and cannot for the life of me find a
plain old Spiraea Thunbergii.(Green leaves, white flowers) The very
few that I am able to find (mail order and locally) are the newer
varieties with yellow leaves or pink flowers. I searched in vain last
fall for one and now have gone another planting season without one.
They are in bloom right now, and I am just frantic to find one.
PLEASE HELP!

Maybe this will help:
http://monticello.avenue.org/garden/nurseries.html