photo sources

low price

dreamstime: about HK$10/image

istockphoto: about HK$30/image

fotolia: about US$3/medium image

canstockphoto (subscription)

shutterstock (subscription)

bigstockphoto: US$1,2,4,6

stockxpert: US$1 for 800x600 image

free

nasa earth observatory

nasa visible earth

free, non-commerial

free webpage headers