Omron have wireless Device Net. Don,t know the price yet as the devices have not been approved in Australia yet. Our authorities have to be as slow as a wet week in approving these things. If the price is OK, it may be a solution for you.
I had a look at the ccontrols devices and found them far too expensive. Also, you cannot "loop in - loop out" connect them - only 2 per Device Net network. Have not looked at the other ones mentioned in one reply - going looking now.
beerchug
Just been there - PRICEY. Have already forgotten about them. Cheaper to use more PLC's and Ethernet.