You can get it directly off the MLS in many (US) states. Of course, a staged home may not provide the same quality of data that a view inside a lived-in house would, and if your home hasn't gone up for sale in a long time it may not have anything relevant to say. But the gaps in that dataset feel far smaller than the "I don't own a roomba" gap in this dataset.

The credit card people provide details on what/where/when/how much was purchased. The "loyalty" programs at stores tell them exaclty what items.