Did you check comparisonpricing.com? It's not gonna capture ebay deals nor closeouts from smaller e-tailers, but it'll review the prices for most of the major online sellers. Sometimes helpful, in case you didn't already check there.
Originally Posted by myitch
Looking for deals on XT 9 spd cassettes, chains, and 545 pedals. Lowest so far: $70 cassette, $20 on chain.
We rejoice in our suffering, knowing that suffering produces endurance, and endurance produces character.
Have you checked www.chainreactioncycles.com? When I was shopping for new parts, they beat all US shops on Shimano parts by a landslide. And if you order more than about $250 or $300 of product, shipping is freeeee.