Availability Limit caps how many bottles of a wine a customer can buy. This is useful for rare or small-batch wines.
The options
No limit (the default).
Number of bottles per order: for example, no more than 2 bottles in one order.
Number of bottles per # month(s): for example, no more than 6 bottles every 12 months.
Set a limit
Go to Settings > Products > Bottles.
Click the wine's name.
Under Pricing, check List your wine for sale? is Yes.
In Availability Limit, choose an option and enter the number of bottles (and months, if asked).
Click Save.
If a customer is entitled to more than one limit
Customers get the highest limit they're entitled to. For example, if Club A members can buy 6 bottles and Club B members can buy 12, a member of both clubs can buy 12.