Hey where are you getting this? Sounds like you are at an exotic fish store or something let me know...btw not going to get it lol don't have a tank big enough lol
There are 19 species in the Malapterus genus, most looking quite alike, so I'd recommend not jumping to conclusions as to the ID. Some grow to 3', others to 1' and everything in between.
I have seen several trade-ins in the foot range for $50-$80.
I had one 30 years ago, I remember it shocking me good on several occasions while cleaning the tank. They are Cool but not very active until the lights go out.