Hovabators hold two clutches, even if they're large. You just can't put them in bins, you have to put all the eggs directly into the incubator.
Have you seen ZooMed's new ReptiBator? This thing looks NICE. Tremendous value for the price. It could also hold at least 2 clutches, and may have the headroom to allow you to put them in boxes, too. It's taller than a HovaBator from what I understand.
YouTube - Zoo Med Reptibator Reptile Incubator - The Best Digital Incubator
The sole issue I see with it is, I would want an audible alarm, not just a flashing display, so I would probably hook up a separate temperature alarm. But the fact you can just take this thing, plug it into the wall, set it, and incubate two clutches...that's pretty darned nice.