Metric or barleycorns? What sort of stuff do you usually do?
There are lots of thread repair die-only sets out there, but not much in thread cutting.
However, 99.948% of the time I'm using a die, it's for cleaning up a thread... I'm rarely trying to cut new threads with a die. (Both cleanup and cutting are fairly common with taps, of course.)
So if I had a similar hankering, I'd buy a nice metric (I rarely use inch stuff) thread repair set, and then buy onesies of the few I might need for thread cutting. Why look, that's exactly what is in my garage right this very second... a set of repair dies and several individual cutting dies.
But YMMV. Depends greatly on the sort of stuff you monkey around with.
And you might find that a tap & die set is cheaper, even though you don't need more taps. That's just how they're usually packaged.