Backlinks Required from decent PR sites

We need 500+ Do Follow backlinks each on the following keywords from decent PR sites Keyword : Thawte SSL Certificate URL : [login to view URL] Keyword : Thawte Web Server Certificate URL : [login to view URL] Keyword : Thawte SGC SuperCert URL : [login to view URL] Keyword : Thawte Wildcard Server Certificate URL : [login to view URL] The backlinks should be preferably from US sites. We need 500 backlinks each for the above, so it will be 500 x 4 = 2000 backlinks. We do not want Angela paul style backlinking.. only want backlinks from decebt websites, social networks or blogs.... Our budget is USD 50.00.. pls do not bid higher than this else we will reject the bid. Let us know your committments in the bid PS : We will do 100% escrow payment and will be released once you achieve the promised deliverables