This is a ground cover shrub that seems to do very well in heat and direct sun. any idea what it is?
That is the inimitable Rhus aromatica 'Gro-Lo'.
It is quite often used along sidewalks and in parking lot traffic islands. Grows like a flat (to 2' or so) mat, rather than as a rounder taller shrub like the species Fragrant Sumac.
Now I just have to find some seeds for this plant. Any idea where I could get some?
I don't know that it would come true from seed since it's a named cultivar--you'd probably be better off buying a plant unless you want to take a chance on the growth habit not being the same. (The species Rhus aromatica can get quite a bit taller so you may not get the groundcover effect you want if you try to start one from seed)
Here are mail order nurseries that offer plants: http://davesgarden.com/products/ps/go/98024/
Yes I can get cuttings but I don't know how to grow from cuttings?