Backup Inverter Suggestions

Hey team, looking for recommendations for a backup pure sine inverter around 1000 watts. I currently have a Magnum MMS1012 installed which is a pure sine charging inverter. I'm looking for an inexpensive, plain Jane, pure sine inverter, non-charging, to be a back up in case the Magnum goes down. I don't want to be caught without an inverter because the wife requires a CPAP and I don't want to run a generator.

Thoughts?