They don't really sell by that size. But half a pint is about 235ml so that's either going to be 5 of the tiny 50ml bottles for a total of $6ish or you could get one of the 750ml bottles (about 1.75pints) for about $12.
I don't usually buy in those quantities because larger bottles are a better bargain per volume. However, if I had to venture a guess, I'd say $3-7, depending on the brand.
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