iStock : Owned by Getty; offers a mix of "Essentials" (budget) and "Signature" (premium) tiers.
Shutterstock : One of the largest libraries with over 700 million assets.
Most sites offer subscriptions (best for high volume) or credit packs (best for occasional one-off purchases).
You pay based on specific usage (e.g., duration, geographic region, or number of views). It can offer exclusivity , ensuring your competitors don't use the same image.
Getty Images : High-end, often exclusive editorial and prestige content.