how to do link exchange with website of pr3

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hello mylotters please reply those person who has knowledge in link exchange area. i give link to my pr2 blog to some website at the cost of money. but one person is asking me to build 50 link for his website with auto or beauty or health related website. i don't know how to contact those website for link. can any one here suggest me how do you do this job. please give me some good idea so that i can do this work. thanks in advance.