Look for it as Miscanthus giganteus or Miscanthus floridus.

Bluestem sells it.

Here is a link that might be useful: Miscanthus giganteus at Bluestem

Miscanthus Floridulus is very appealing to purchase after seeing nice clumps growing. Be careful where you plant it, as it spreads quickly and is hard to dig up. The roots easily go down 24". Also, the little pot that I planted five years ago is now 5'4" across the stump where I cut down the grass this year (with a chain saw!).

Earthly Pursuits carries both you are looking for.

I have found it on ebay.