Here's the kind of convenience I don't mind spending my money on:
It's called the Reveal by Rubbermaid. Unlike similar models, the Reveal doesn't have disposable pads to throw away and the refillable well will hold any solution you like...it even suggests vinegar right on the package. What's even better? They sell additional (reusable) pads and wells separately:
I keep one well filled with homemade orange infused vinegar solution and the other filled with yummy smelling almond Method wood floor cleaner. Eventually, I'll get around to making a few extra pads from old towels like in this tutorial. But for now, I'm thrilled that I can buy a little convenience that doesn't give me a guilty conscience!