Most hobbiests get it from their own stock or from cuttings they get from local growers. But you can order it online. I've attached a link to a relatively local (Temecula) grower but there are other sources online if you search.

With a little trial and error, maple grafting is quite doable for the average Joe/Josephine but the same link offers a grafting DVD video that might explain/illustrate it better if you've never grafted before.

Do you have rootstock available?

Here is a link that might be useful: somewhat local source

Here's a couple of links to threads where I chronicled my first and second year of grafting. How-to slide show, and there is no charge. :)

First Year - On the second page is a link to the grafting slide show:

http://www.ubcbotanicalgarden.org/forums/showthread.php?t=48128

Second Year (this year):

http://www.ubcbotanicalgarden.org/forums/showthread.php?t=60036

Thank you both so much for your reponses. I do quite a bit with orchids, and love the maples even more. I just planted six different varieties in front of my newly purchased home and am eagerly awaiting spring to see my leaves poppin!

I am chilling some seeds in fridge now, and will eventually use them as root stock. I know it is too late to graft this year but would love to next year. Where is a good place to get some good rootstock? Does the Temecula place sell it?

Thanks!

Pacific Coast Maples (GardenGal's link above)sells rootstock in quantities of 25. I get mine from Heritage Seedlings in lots of 100. I have them delivered in October or early November (they come as bare root "plugs") and put them in 4" pots. I think 1/4" caliper works the best. Order early - they can run out.