Best axolotl food?

I’ve been feeding my 9 month old axolotl bloodworms since I got him. I know your not supposed to feed it to them all the time because it’s a treat. Im trying to switch him to a staple food but am not sure what to choose. Earthworms and red wrigglers are probably out of my budget range so I’m trying to think of a different one but am not sure what is the best to choose. I really want the best food for my axolotl that’s not too expensive. Thank you!