If you’re talking breeder reactors

I was talking about reusing uranium from “spent” fuel, not about using plutonium. Found source that says “spent” fuel is 95-98% is mix of uranium isotopes that were there. Sadly, source doesn’t say how much of each isopote, I expect very low amount of U-235. Yes, you can also use plutonium in MOX fuel, but only Russia, France and China do that, as far as I know.

do we have any in the US?

Dunno. Do you? If you don’t, you can buy them from mentioned above countries.