Deal hunters should take note today. Mint Mobile is running a very, very short-term promotional offer that expires tonight. For a slightly crazy $8.33 a month (or $100 a year), you can get a 4GB/mo plan through the MVNO with unlimited talk & text, but there is a catch. You'll need to sign a 25-year "contract" to get it, for an up-front total of $2,500.

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