I dunno about african (Baby) arowana.. but i know where they sell Baby jardini... as of 4 weeks ago...
Garvey fish store in Rosemead had some.. about 45 for a 3" baby...
I got the first batch 2 months back for 30 bucks.. at 2" I dunno if they have anymore.. but they are by far the best store to actually get regular good shipments of Arowana.. so i recommend giving it a try..
Its around the cross road of Garvey Ave. and San Gabriel Blvd. HUGE blue building. Google and find it..
As for african.. I have not seen any in my LFS.. sorry..