Marketplace
A bit of a niche deal, but I personally buy one of these packages almost every time this deal comes around (usually around Easter and Black Friday every year). You purchase a code that is good for 100 stockphoto/vector downloads of any size at DepositPhotos. These credits never expire, so they're good for the occasional user, e.g. blogger, web dev, cover designer, who doesn't want to sign up for a stockphoto site with a subscription model.
The images come with a standard licence and can be used for blog entries/headers/graphic design/social media posts/eBook covers etc. without any attribution. You only need to provide credit attribution to an image if it's used as an editorial image. Images can also be used for commercial use.