Recommendations on portable power stations

After one too many blackouts for the past few years, we're in the market for a backup power solution.

Guidelines include:

• Would rather have multiple smaller units than one large one.
• Should be enough to charge phones, watch a television, run the Keurig. If it can spike up enough to run a heater or keep the fridge from spoiling, that's a bonus.
• Would like to keep it at ~$300 a unit.

We're looking into a whole home generac as well, but this is more of a bandaid trial solution for now.