Jeff Michels at Aquatic Clarity has wild dorsigera. I have a box coming from him today.
If you want hardy, go with Laetacara. Since they’re essentially dwarf acaras they are very similar in behavior and requirements to your electric blues. Clean water and good food is all you need. Their spawning colors are beautiful and they’re chunky, feisty little fish. Don’t keep them in pairs — like most acaras, males can easily turn on females if there’s a disagreement. I had that happen with two separate pairs so now I only keep them in groups of 4 or more.