At this rate I'll still have enough stock for the next 100 years 
The problem is that when I run out of, say, medium, how many more do I buy? There's a £10 delivery charge if I buy 1 or 50. And if I buy another 20 or so, will I ever sell them?

The problem is that when I run out of, say, medium, how many more do I buy? There's a £10 delivery charge if I buy 1 or 50. And if I buy another 20 or so, will I ever sell them?
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