I have a few nice pairs of kribensis ( Pelvicachromis pulcher) who are in excellent health, about 10 months old, and are looking to spawn (or spawning). These hardy fish display beautiful colours, especially in breeding mode, with great instinctual breeding and parenting skills. They are easy to care for and breed. They are semi-aggressive, so at breeding time will keep any other fish away from the nest, however.
$10 for the pair
First pic was from the web, the other two are my own. It's hard to get a clear pic, they just keep moving!!!