If i were to make the pellet cheap i'd simply go with:
frozen salmon (Protien and pigmentation) - frozen talipia
frozen beefheart (protien) - shrimp
frozen peas (aid in digestion) - same
hardboiled egg (all sorts of nutrients) - same
dried crickets (pigmentaion and other stuff) - you have the protein and stuff for pigmentation maybe you should perhaps add earthworms if you want something else in it
dried krill (same as above) - shrimp shell
fish oil (omegas and other vitamins) - yes add that
spirulina powder (all around wonder food) - also add this
garlic (anti parasite) - same (just not too much or else it'll smell really wierd)
cornstarch (binder) - need this
should run quite a bit cheaper then the original formula.
for a vegatable one you could go with peas, carrots, nuts (a little protein for it) the fishoil, spirula and cornstarch as the binder again.
maybe tommarow i'll try and make a few pellets!!! I'm thinking for mine i'll go earthworms, a few crickets, frozen bloodworms/mysis shrimp/shrimp/tilipia peas and cornmeal and i'll see how it works out.