I just made a large order from Sheilam nursery in South Africa, and was pleased. The prices are great as they are in Rands, and even with postage and phyto permits they worked out at about 3 bucks each for rare plants. A good way of getting plants not easily available here in the US.
I also bought from Shoal Nurseries, and the plants were about 20% more than other nurseries, but were much larger, and I heartily recommend them.
I also bought 50 odd plants from
Mesa Gardens, and the plants were somewhat small, but very inexpensive and the service was great. I very much recommend them.