I have heard that scholarships are available from several schools, sometimes to only one harpist at a time or per year. Look at Peabody, Oberlin, Ball State, Boston University, etc. As for a scholarship that will pay you to go where you want, I’ve never heard of such a thing. They are usually tied to a school.
A lot of schools have partial scholarships for harpists who play in their ensembles this way they ensure they have a harpist in the group. The idea that playing the harp automatically guarantees you a scholarship at college is really misguided but a lot of people do seem to get that idea. Harp often doesn’t get scholarships at all because it is viewed as a non-essential instrument in music programs. The big scholarships go to piano and violin because those are the instruments schools are most judged by.
That’s not to say you couldn’t get one but just to give a more realistic picture.
> long ago told me that being a harpist gives you an advantage because you can get lots of scholarships
Even in those long ago distant days (ah, the golden era), it was only from a few schools that were desperate for a harpist for their orchestra (not conservatory type schools, but liberal arts colleges back when things like symphonies were considered important). It was never “go anywhere, get a scholarship just for being a harpist”, unfortunately.