Apple retailers frequently discount iPhones, Macs and iPads for Black Friday.
Apple Sells Out of Initial iPhone 4 Shipment
Following in AT&T's footsteps, Apple has sold out of the initial allotment of iPhone 4s for launch day. The Apple online store now lists July 2nd as the earliest ship date that you can receive an iPhone 4.
Stores may still have stock on launch day for walk-in traffic, but it seems the allotment for pre-orders has been filled. The iPhone 4 will launch on June 24th, 2010.