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I believe you current deal #'s are off. It's $19.99 and the coupon only saves 20% so it's $16.00 at checkout.
Looks like the deal expired yesterday. Good catch. Now it's $8.12 at Amazon, though. Not as good as $4, but certainly better than $16!
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$14.99$11.24at Steam Store
$15.99$11.09at Green Man Gaming
$489.99$399.99at Dell Home