If there's anyone in this community who'd like to try growing grapes but they want a better selection than most nurseries carry, here's a website you need to visit:
http://www.bunchgrapes.com/index.html Lon Rombough sells GRAPE CUTTINGS amongst other things and he includes detailed instructions for rooting them.
The nice thing about his website is that he includes how cold-hardy each particular grape variety is. For those of us in zone 6 and further down, that's very important. (He even has some varieties that are hardy down to -30 or even -40F!)
Note: Last time I checked Rombough has some video's posted on youtube about grapes.