Depends on the LFS
If they order it in "uncured" , and cure it themselves, then you could ask to get it when they get a new shipment in. Another thought is to ask if you can have some of the rubble that comes off duting the curing process (add to your base rock that you are trying to culture), thats if they cure it themselves.
Do a search on LR by using the "search button on this board". Upper right corner. You will find a better explanation than I could ever give.
Decay = ammonia = trites. bacteria = breakdown = trates (sort of)
When ammonia = 0
And nitrites = 0
And niteates = less than 20 its pretty much cured
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