Here are some web references for LRR articles. These should give you a decent start on that research...
http://forums.tdiclub.com/showthread.php?t=111009
http://www.autobloggreen.com/2007/09...n-for-the-peu/

Here's a site for tire rebates. I think this one is out of date but they may have other pages that are more applicable to today's market.
http://www.fatwallet.com/t/18/731371/