If you are old enough to have been vaccinated for smallpox you already are. It works for monkeypox, too.
If not, you really don’t need it unless you’re a promiscuous gay man or a lab worker dealing with blood samples from monkeypox patients, or someone in your household has monkeypox. It’s really not all that easy to catch.
Which is why it has so far been mostly limited to homosexual men.
There is a large population of homosexual men in this country that, by their own estimates, sodomize or are sodomized by literally hundreds of different strangers per year. If you introduce any communicable disease to this group it will quickly and inevitably spread to thousands of homosexual men throughout the country.
If it is an easily communicable disease like COVID, then they will just accelerate the spread to the entire population. If it is a difficult to catch disease like AIDS or other venereal diseases, then the spread will be mostly limited to homosexual men.
Apparently, Monkeypox is somewhere in between. It is not a strictly venereal disease and can be spread without sexual contact, but it is not airborne and requires some physical contact.