So I found another place that has lots of umbels (and bulbs) in stock - that is Rasa Creek in BC. Don't know if anyone has experience with them? The shipping is a flat $15 for all orders, which is less than the other place, and they do have lots to choose from.
I would have loved to order from Henry's or his brother's place, but it turns out you have to place orders for bulbils early on before they cut the scapes, and I didn't even think about it until middle of August...
Anyway BC is very far from us and a totally different climate, but I haven't found much available closer to the east coast, with a nice selection of garlics and also bulbils..