One of the guys from the Tropical Fish Society of Rhode Island raises lots of live foods (including microworms) and sells his extras as starter cultures.
If you check the Boston Aquarium Society forum there should be a post with details there.
Microworms are easy to raise, and a little smaller than baby brine, but the baby brine are more nutritious if fed right away. So if your fry are big enough, I'd use the baby brine shrimp.
And microworms are a real PITA in a retail environment - not "shelf stable" enough to keep around, and not enough demand for them.
(which is why I'm hoping Ned won't mind me posting about the worms
) So microworms are usually bought via mailorder or thru the fishclubs.
Hey Ned - since I've been too lazy to raise any baby brine lately (or working too much I guess) and I've got a few batches of cichlid fry, I could probably use some baby brine - how much $ for a portion ?
(I've overdue for another visit to the store anyway...)