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deals-all-year via eBay has the Canon EF 24-70mm f/4L IS USM for $599.99. Since this is not an authorized dealer, a 1-year Canon USA warranty is not guaranteed. They are, however, a reputable store.
If grey market is a concern, please consider our street price of $799, brand new from an authorized dealer, with a 1-year Canon USA warranty. No tax is collected to most states.