As we reported not long ago, Boost and Virgin Mobile - Sprint's two prepaid brands - are selling the Samsung Galaxy S8 for the lowest price available in the US (barring deals and promo offers): $649.99. Starting this week, though, Boost has an even better deal, allowing customers to buy a brand new Galaxy S8 for only $520 off contract - that's 20% off the regular price. You can get the Galaxy S8 for just $520 if you're purchasing it from Boost Mobile's website (see the source link below) and enter the promo code BOOST17 at checkout. Important: this is an online only offer, and will end on June 15, or when supplies end. Undoubtedly, this one of the nicest new Galaxy flagship deals we've seen in the US recently. We do have to note that the S8 phone that Boost is selling is not unlocked, and you may have to use it for at least 1 year on Boost (where monthly plans start at $35) before being able to unlock it for free. While trying to decide if you want to buy the Galaxy S8 from Boost Mobile, checking out our review of the handset may be a good idea.