Niche Stock Image Sites
easterstockphotos.com
Images of Easter and Christianity themes
goodsalt.com
The world's leading source of religious imagery
picjew
Purchase pictures of "Jewish way of life"
forgivenstock
Collection of Christian Stock Photography
Microstock Sites
Religion @ bigstock.com
Travel search results from their microstock collection
Free Sites
freelyphotos.com
A really nice collection of Christian CC0 images, categories for bible study, prayer, crosses and so on.
The images above are priced from around $1