Hi Gina, welcome back. I just returned from a long absence recently and it's good to hear voices from the past joining in...
I buy my bulbs from Van Engelen / Scheepers and cannot remember having a single problem in twenty years. The two companies have common ownership and they sell the same bulbs. Their catalogues arrive together. Scheepers has a beautiful catalogue, small lot sizes, higher prices. VE is the wholesale branch: large lot sizes, no photos, low prices. I look at the Scheepers catalogue and buy from the Van Engelen site.
I have also bought from Van Bourgondien. Here the quality is spotty. I cannot recommend any of their non-bulb offerings. Thinking of their dahlias and cannas, it is not uncommon for their bags of five to contain two absolutely wonderful specimens, two rather marginal specimens, and a bit of a root. So instead of getting a screaming deal you get... two plants for the price of two. Still, sometimes it works. Mostly bulbs arrive in good condition.
Sorry I can't be of any help with shade structures, my property just won't accommodate any. Not unless you consider the rose arches to be shade structures.
It seems pretty unlikely this is anything like a practical solution, but if it worked it could be pretty cool: You might plant a Lady Banks rose on the structure. When it loses leaves in fall, it will let light in. Then it could provide shade in warm months when it's leafed out. By clever pruning you could adjust how much light enters and where. And you can keep changing your mind... The downside is that it will want quite a bit of water, especially while it is getting established.