I'm not sure if it's what you're asking for, but I personally like Forged Foam arrow head kits. They aren't The Best in any particular category, but they work well, and at $3 a pop are affordable. (Also they result in a head safe arrows, for games where that is allowed. Also means they're a lot nicer when accidental headshots happen.) https://www.forgedfoam.com/product/arrow-kit/

People really like Gorg arrows. They are a fully built modular arrowhead though, so I don't think that's what you were asking for. https://www.gorgtech.com/category/foam-archery/

Some people like PennQ foam tennis balls (cut in half) for their arrow heads. However they can have a lot of bounce-back (as you might expect from a quasi-tennis ball) so their safety can be arguable. (They also hit a little meaner than the above, so often don't pass at head legal games. Fine for hit at most larps though.) Here is an example link: www.amazon.com/Penn-Foam-Tennis-Balls-Red-Yellow/dp/B07BVXYTGL