No one polices the industry, and that demands your vigilance. In addition, independent contractors often work for many Disc Jockey companies. Imagine two weeks before your wedding, the performer that you were guaranteed is suddenly substituted because they received a better monetary offer from another company or client. Now you have a Disc Jockey you have never met performing at your wedding. You will no doubt be completely stressed, wondering if they will represent you well, let alone show up.
Prices are also an accurate indicator of how a service operates.
If the price is too good to be true, be wary. Low prices can be a direct sign of a company that is ignorant or noncompliant to the tax system. Second, obtain proof of legitimacy. Ask if the company carries liability and workers' compensation insurance. There are serious penalties for employers that do not carry workers' compensation insurance.