I often buy online as it's convenient and saves time, and my top picks are definitely Amazon and eBay. However, I've learned the hard way to always check reviews before making a purchase, especially from lesser-known sites. For example, check other company reviews here. It's saved me from scams and low-quality products. Customer service can make or break the experience, and I've had mixed results, but Amazon's been consistently responsive. I prefer buying electronics and clothing online for the variety and often better prices.