Here's the problem...
most of what I turn requires it to be dry in the respect that it has reached the equilibrium moisture content that my environment will allow.
I have been buying exotics for 10+ years, I bring it home, mark the date on it and put it in the house.Yes, the house. A bone of contention at times, but spare and upper shelves of closets can hide a bit,
When I need some exotics, I pick from older stock,(which has the most likelihood of being "dry").
Maples and domestic burl drys faster usually (not as dense).
Anyway, when I want to use it, I take the wood and put it in the shop for a few days. Then cut it and let it sit for a few days. If it isn't a spiderweb when done, then we turn. ADD sometimes takes over and it doesn't get turned for months.
But with most exotic dealers that have a fair amount of turnover of product, you can ask when it was cut/imported and get a fairly accurate time frame. Beware of those that are thick and kiln dried. Even if they kiln dried something 16/4, it would have taken a long time in the kiln to dry it without stress (maybe never?) so you need to be suspicious of that.
It becomes a lot of speculative buys, not knowing exactly what direction I will be on in a few years, but I have an awesome collection.