Washington ( CNN ) -- U.S. officials used Cyber Monday to announce court orders shutting down 150 domain names of commercial websites they say were selling `` many millions '' of dollars worth of counterfeit goods . Sports jerseys and uniforms , DVDs , shoes and handbags , golf sets and exercise equipment were among the more popular purchases of `` knock off '' versions of name brand products , officials said . Investigations show the majority of those engaged in defrauding rights-holding companies and consumers are from China , but the phony goods are also produced in other countries , according to top law enforcement officials . The officials say they conduct undercover purchases with the help of legitimate rights holders to confirm the goods are bogus . They acknowledge the operators of the websites are beyond the reach of U.S. agents , and when the sites selling counterfeit goods are shut down , the same criminal enterprises sometimes simply change domain names and continue to prey on customers . The Immigration and Customs Enforcement agency , the FBI and U.S. attorney offices cooperated in the investigation , dubbed Operation In Our Sites . This marked the second annual Cyber Monday crackdown . Last year , the government shut down 80 websites . `` We will not tolerate those who seek to profit by abusing the Internet and stealing intellectual property at the expense of authors , artists , and inventors , '' said Assistant Attorney General Lanny Breuer . Breuer and ICE Director John Morton said that despite the challenges , increased international cooperation is helping to wage war on the theft of intellectual property . The operation they announced Monday is designed in part to educate consumers to be wary of websites that appear to be offering name brand products at substantially reduced prices . Authorities say they are unable to provide estimates of losses from cyber criminals , but are concerned that some of the millions of dollars in proceeds may end up in the hands of organized crime . The government places banners on the seized websites explaining why they were shut down . Last year , the banners registered 77 million hits , so authorities are hopeful public awareness of the criminal nature of the problem is increasing . `` This is simply downright theft , '' Morton said . Beyond clothing and electronic knock-offs , he said , officials are especially worried about the threat to safety and health when counterfeit goods involve such things as air bags , drugs , car batteries and engine parts . `` If the price is too good to be true , it probably is , '' said Morton , who added consumers can help themselves by being on the lookout for misleading labels and spelling errors to avoid getting ripped off . CNN 's Jim Barnett contributed to this report .
` ` Many millions '' of dollars worth of counterfeit goods were being sold , officials say . Officials : Most of the websites used to draw in unwary consumers are from China . Assistant attorney general : ` ` We will not tolerate those who seek to profit by abusing the laws ''