Pre-owned panels are an attractive option for the frugal, as well as DIY enthusiasts, tinkerers and homesteaders. Their cost varies with age and output. Older panels, which usually have lower wattage, can be found online for under $50. Newer ones tend to have higher wattage and can cost several times as much. But any secondhand panel from the next town over will be tariff-free, whereas the majority of new panels installed in the US are imported, so subject to a levy.