I've ordered from David Austin (http://www.davidaustinroses.com). It's been awhile (2002) but I was happy with the order. Most of what I ordered from him that year are gone (mostly due to BS) but I still have (and enjoy) Heritage and James Galway.

GC was one I ordered. I don't know why I did because I don't really like yellow. It black spotted too much so I got rid of it in the third or fourth season.

Daylily Hill sends nice plants and shows it currently in stock.

Kathy

Here is a link that might be useful: Golden Celebration at Daylily Hill

In a climate where blackspot isn't a problem, Golden Celebration's lovely.
It's not troubled by mildew or rust, and very little by anthracnose or cercospora, and the fragrance is terrific.

Jeri

You can get it budded onto Multiflora from Pickering Nursery in Canada. I have an order of Austins coming from then in March.

Connie

I have a GC from David Austin Roses and I also have an own-root one from Heirloom Roses. Both have them in stock as of a moment ago, I just checked both websites.

I bought mine at Costco a few years ago and have seen them at HD occasionally in the past.

LORDY DON'T BUY FROM MICHIGAN BULB!! I have a posting on my horror story with that sorry excuse for a plant distributor.