http://www.parkseed.com/gardening/PD/5886/. These are the 45 day variety. They should be about 10-15 inches tall.
Shipping is $2.95 for under $10.00 and $3.95 for over $10.00
I picked up 5 packs of seeds and am seriously thinking about getting a few more.
There's another company I saw that carries several varieties of raab including long season. Never heard of them before but they seem very good going by their website:
http://www.italianseedandtool.com/results.cgis?catalog=ISATFULL&keywords=rapini&image22.x=0&image22.y=0&image22=searchThis is a YUMMY vegetable and is delish cooked in olive oil, garlic and a few red pepper flakes. Mmmmm-Mmmmm good eats!