Hi, Andi. It's so good to hear from you. I'm sorry you lost your other Austins, but Crown Princess Margareta is a fine one, so I'm glad you still have that one.
If I were you, I would order my Austins from Roses Unlimited, which has a new website.
The Austins are $19 each, shipping to your state is $6 per rose, and there's a $5 handling charge for each order, no matter how large the order is. The Canadian nurseries are not a good source for Austins. Pickering is gone, Palatine no longer carries Austins, and Hortico is an iffy source -- sometimes good, but usually bad.
I prefer the grafted Austins, but if you want own-root plants, then Roses Unlimited might be the best choice for you. Their plants are larger and more reasonably priced than the plants of most other own-root nurseries. They have Sharifa Asma. Here's the full list of their English roses.
I think the best white Austin is Fair Bianca, and Roses Unlimited does carry that one. They also have Wildeve, which I remember as one of your favorites. Gruss an Aachen is listed among their floribundas, which are $18 each. Souvenir de la Malmaison is listed (but misspelled as Malmaision) among their bourbons for $18. Alchymist is listed among their shrubs, also for $18. The Fairy is listed among their polyanthas for $17.
So, this could be a one-stop shop, but there are a couple of things you might want to consider: Are you aware that Alchymist is a once-bloomer? Are you also aware that The Fairy might be too large for your containers?