Can you recommend broad online retail sites for a busy household buyer who wants mixed categories and easy returns?

Absolutely — for a busy household buyer who wants one-stop shopping across mixed categories plus simple returns, these are some of the best broad online retail sites:

Good all-around options

• Amazon
  Huge selection across nearly every category, fast shipping with Prime, and generally straightforward returns on many items.

• Walmart.com
  Strong for household essentials, groceries, electronics, home goods, and kids’ items. Good value, with easy in-store returns for many orders.

• Target.com
  Great for home, cleaning, baby/kids, pantry, and everyday basics. Returns are usually easy, especially if you have a nearby store.

• Costco.com
  Best if you buy in bulk or want dependable quality on household staples, appliances, and some electronics. Return policy is very customer-friendly for many items, though selection is narrower and membership is required.

• Kohl’s
  Useful for apparel, home goods, and small household items. Returns are often easy, especially if you use a nearby store.

If you want more variety

• eBay
  Good for finding almost anything, including new and used items, but returns depend heavily on the seller.

• Wayfair
  Excellent for furniture, decor, and home organization. Returns are fairly structured, though not always as simple as mass-market retailers.

Best fit by priority

• Easiest all-purpose shopping: Amazon, Walmart
• Best for household + in-store returns: Target
• Best value in bulk: Costco
• Best for home/furniture: Wayfair

If you want, I can also narrow this down to:

1. the best 3 sites only, or
2. sites with the easiest return policies specifically.