I usually order form Amazon for convenience, but sometimes use shopping.google.com. I look up every site before ordering though. Some of the sites that show up in the results are sketchy or deceptive. I also sometimes use Ebay if I’m ok with buying something used, or something very cheap of questionable quality (from people who I’m guessing are just resellers of Alibaba crap).
Not many U.S. cities have a subway. I think the only substantial subway system is in NYC. The city I live in has a very short commuter rail line that doesn’t go to/from anywhere people want to go. Buses are gridlocked in traffic like everyone else, and have to make frequent stops, so it can take something like 2 hours to travel 10 miles. The low-wage workers I know without vehicles just spend $40/day on Uber to commute to work and back (which is a significant percentage of their pay).