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LONDON, England (CNN) -- If you want to peer inside your DNA, there's no shortage of companies offering avenues for doing so these days.

The opportunity to have your complete genome mapped was recently auctioned on eBay -- with the winning bidder shelling out a cool $68,000 in the auction, which ended Monday.

However, more cost-conscious consumers are more likely to send in a saliva sample to a company like Google-backed 23andMe, which will scan and analyze genetic information for about $400.

The costs and services these firms offer vary widely, but they're basically chasing the same market: the customer who is curious about what their genes can tell them about themselves.

Welcome to the world of personal genomics. A spate of firms -- from 23andMe and fellow Silicon Valley start-up Navigenics to Cambridge, Mass.-based Knome and Iceland's DeCode Genetics -- are vying to tap the growing interest in DNA analysis among individuals.

They're upbeat about the promise of this business, saying that consumers' ability to gauge how their genes influence risk for diseases like diabetes and cancer could revolutionize...