U know, i've been wondering that too of late. At PetCo they have a great selection of drift wood, with anubia (or however u spell that) attached. Beautiful looking things, and i just know my Iggy and Shippo will love to have those in the tank.
The problem, however, i see with these, is that they have already acclimated to the tank at the store, and plants are extremely delicate. Especially those attached to non rooted surfaces (such as drift wood, rocks, etc). As most of the roots are usually exposed, the movement of the plant to the bag, bag to the tank, especially to a tank w/o the same heat, and parameters, can be very stressful for the plant.
I have yet to have one live, unfortunately. I think it'd be best to buy the plant, and driftwood separately, and then just plant them together. As the plant is bigger (and not in it's infancy, such as the ones at the store), they probably will have a longer shelf life.
Right now, tho i'm not doing live plants, aside from a live lilly pad. But other than that, iggy is happy with his artificial setup.