How Fast Do They Sell Out?

From everything I've read I understand that I should order as many vials as I think I'm going to need up front as donors are known to sell out quickly.

Can anyone tell me... how fast we are talking here? Let's say I order a few vials and I need to order more in a month, what are the chances of my donor still being available? At what length of time do they donate for, approximately?
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