"Lost" the bottom string on my pleated day / night blind?

Alan_Hepburn wrote:
It is incredibly expensive, compared to buying new string. I got a 200yd roll of string for about $5 at a big box store.

I agree with the expensive part - I've been quoted over $400 to replace the 4-string big blind in my big window.

From which big box store did you buy the string? I've looked in Lowes and Home Depot and couldn't get it.