That is a strange answer. I'm sure they are not the most popular fish in the hobby, not even the most popular cichlid. $2 a fish is not a great deal on those either. I'm guessing they sell for between 20-40 each. I'd like some taiwan bee shrimp for $5 a pop but that doesn't mean it's going to happen.
Some fish store's are not worth dealing with and will give you almost nothing in store credit and only take super high quality adult fish, in very small quantities. They should be giving you at least 40% of what they sell the fish for in store credit, or 25% in cash. Good stores give you 50% or more in credit.