My client sells products through internet and major traffic comes through search engines. At present he has top level .com domain. Now he wants to create few country specific top level domain link co.uk with same content as the main site but with country specific prices.

Since Google comes down heavily on sites with duplicate content, I like to have your valuable suggestion on right strategy to use so that main site will continue to have same rankings while mirrored country specific sites with same content except country specific prices will also have good rankings on country specific keywords.