The Samsung Galaxy S4 might be a new phone, but there are already some great deals to be had online. Amazon previously lowered the price to $168, but now it's down to just $129.99 for new lines, and $139.99 for upgrades on existing ones.

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These deals will, of course, require you to sign up for 2 years of service. Just make absolutely sure this is the device you want to use the upgrade on – AT&T recently changed the upgrade eligibility term from 20 months to 24 months.

[Galaxy S4 (white), Galaxy S4 (black)]