Oxiclean Versatile Free is a popular percarbonate based cleanser. The FREE version is dye, perfume and chlorine free.
Some homebrewers (including myself) use this as a budget replacement for PBW.
Update: Since this post was published the price, availability or promotion has changed. Check the product page for current description, price and availability. Also: Today’s Deals on Amazon
More: Recent Amazon Recent Amazon Finds [view more]: Five Star PBW Cleaner at Amazon
Recent Amazon Finds [view more]:
Five Star PBW Cleaner at Amazon