Comstock is of course the mother of stock photography for those in the advertising & graphic design industry.
Luckily for us designers today, there a number of impressive photographic sources which offer images either free of charge or for minimal costs. Herewith are some top options:
Fotolia - Royalty Free Stock Photos: Fotolia is a low-priced stock photography clearing house, offering over 5 million images for use across the web at prices. www.fotolia.com