Items like this Tatung Heat Devil ceramic heater are often OVERLOOKED by estate sale organizers as well as customers. I frequently find items like this on the SECOND DAY of an estate sale. I'll take the time to look them up by keyword in the eBay app (or use Google Lens) and I'm pleasantly surprised to see that vintage items like this sell for $50+!
So don't psych yourself out and think that there will not be PROFITABLE items still available on the second day of estate sales. Not only do I frequently find items like this on the second day, the prices are usually 1/2 OFF (or more) so I'm buying things super cheap!