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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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$39.99$18.99at Mac Game Store
$24.99$5.93at Mac Game Store
$59.99$48.00at Green Man Gaming
$19.99$4.74at Mac Game Store
$19.99$7.99at Green Man Gaming