I have received two "Guernsey Cream" from Birdsongfarm.com, they may be sold out now also. They seem to be very popular at the moment. I have never ordered from Wayside Gardens because the prices do seem high to me compared to other online nurseries. I did purchase two from a Ebay seller, they were very small, and so far are not showing alot of growth, I'm hoping they are just growing roots. They are healthy looking plants though small.
The two from Bird Song Farm had an incredible root system and have bloomed beautifully this past month. If you are not in a big hurry, I would wait until they are back in stock at Brushwood or Birdsongfarm. I have no experience with gardenerdirect.
Debra

Joy Creek Nursery has it.
http://www.joycreek.com/cl.htm

Silver Star vinery has it listed, though the website says quantities are low.
http://www.silverstarvinery.com/vines.asp?letter=G

Both these are far less expensive than Wayside and have stellar reputations, unlike Wayside.

I have ordered from Silver Star and have been pleased with the quality, but Joy Creek has an excellent reputation as well.

Thanks so much DebraV and nhbabs.

You were a huge help to me and soon a 'Guernsey Cream' will be in my friend's garden again.

Honestly, I looked all over and didn't see those nursery sites that you recommended. Happy digging and sniffing. Here our lilacs are in full swing along with Korean spice viburnum and magnolia 'Jane'.