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Today only, Midnight Mailbox (DEAL TAB 3) has a 4 port USB car charger that lets you charge up to 4 USB devices simultaneously for $3.49 with $3.99 for shipping. Rated at 2.1A/5V, the ports are even capable of quick charging the newer power-hungry iPads.

The same product is $8 at Amazon where it gets 4.5 star reviews.