Nah mate I reckon you could get away with any bucket.
Get 2 99c buckets, put a heap of holes in one bucket & put that one inside the other bucket and you have a Bokashi bucket.
I would use good quality "EM (Effective Micro-Organism) Bokash" though as it makes a difference.
But I reckon there a god send as there are so many things that cant go in the worm farms but everything can go in a EM (Effective Micro-Organism) Bokashi bucket & then into the compost and your getting an amazing amount of nutes from over 100's of sources that you could never use
Oh I use some "Green Sand" in my compost also