There are companies that sell mail-order lab kits. However, some of them have experiments that I do not feel meet the safety standards for unsupervised at-home experimentation. (For example, MEL offers a magnesium-burning experiment. We also have to consider hazardous wastes generated. I'm not sure where the law sits on this, but I err on the side of caution and assume if it would be considered a hazardous waste in a traditional lab, it shouldn't be in an at-home experiment.) I have had a terrible time with shipping delays with mail-order kits through eScience Labs, though. Many kit providers are having supply chain issues due to the impacts of COVID-19 on international shipping.
There are also a lot of examples of kitchen chemistry research available. These use materials that are readily available at an average household. However, just because it is readily available, does not mean it is safe!