Raintree Nursery and One Green World Nursery have selections and individual prices.

Grafting onto newly rooted and lifted stock has some less chance of success compared to say if you grew the stock for a season or a year. I've grafted in late winter (as soon as you generally can get the stock) and then buried the "bench grafts" horizontally in damp cool peat moss for a couple weeks to let the graft heal and fuse a bit before there gets to be any moisture demand by the scion after planting and sprouting. That it helps I'm just guessing. It's an old method.