I just got a regular horse whip on Amazon and I tie flat toys to the end of it.
This one. It's light and springy with enough snap to build drive and long enough that you can get some good distance even with a large dog chasing it. Like I said I tie small stuffed toys or the flat animal toys to it. Sometimes I'll mix it up and find interesting things. Kaiju liked it the time I tied a jingly wicker cat toy to it and let him chase it. It just got torn up pretty quickly.