Today only, prices on the just-released 4th Generation Retina Display iPad drop by $41-61 during the Black Friday Shopping Event at the Apple Store. The 16GB Wifi model drops from $499 to $458. That beats a similar deal we saw at Best Buy yesterday that sold out quickly. The discount increases for models with more storage. Plus, you can get engraving free, a service that no other retailers offer. Sales tax is charged in most states. Bottom-line: if you plan on buying new iPad from the Apple Store this holiday season, today is the best day to do it!