Try some local garden centers. I don't see any vendors listed at helpmefind.com and only a European vendor in the 2007 Combined Rose List.

You can cut out any dead canes and shape the plant as needed. The blackspot you are going to have to treat regularly, as per the directions on the bottle. Immunox application is every 7 days, and it may not clear an active infection. Immunox wasn't successful on blackspot for me. Many people are using Bayer Advanced Disease Control for Roses, Shrubs and Trees or Bayer Advanced All-In-One (combo fungicide, fertilizer and insecticide). They were probably getting too much water. I wouldn't fertilize until you see it growing new leaves.

The Immunox finally worked after about 4 applications. The roses have put on a new flush of nice looking leaves very quickly. Now the concern is the flower buds keep coming up green, not white...is this due to excessive nitrogen?

You might want to look on John's miniature roses for sunblaze. I have a mandrin sunblaze, I got mine from Lowes of all places! Its is georgous, and blooming perfously. The foliage is really dark and glossy too! Guess I got lucky. Hope this helps