Craft/ buy fallen embers

Can we possible have a way to reliably get fallen embers? I love the crucible, but I feel like im limited having to go back into the world which Ive already been through so many times just to farm more fallen embers.

Having a way to reliably get fallen embers would free up time to maybe even create a new character with different stats, finding more/ better strategies to beat the crucible floors

the general merchant sells fallen embers alot of times.