mine devour ghost shrimp and blackworms (both live).
do you have multiple lfs around?
ghost shrimp do start getting expensive. i have two 4" retics and they will go through 20+ ghost shrimp in a single meal.
at even 40cents a shrimp, it starts getting crazy. i was having to buy them new shrimp every other day.
my lfs finally got blackworms in, and hadn't separated them into portions, so i just bought the entire bag. 20$, and i've had them over a week now and not even used 1/4 of the bag. only thing you should do is water change the blackworms daily.
i'd check through multiple lfs' if you can, even if you have to drive a little out of the way.
also try feeding nightcrawlers, earthworms or dew worms. mine seem to like them, only problem is they seem to have trouble passing the dew worms out of their bowels. mine were constipated for a few days trying to expel them. then again, dew worms are the bigger type of worm.