If you're interested in any one of Samsung's newest flagship devices, the Galaxy S10, S10+, and S10e, but haven't gotten round to buying one yet, check out this deal. Samsung's own US online store is currently running a limited time promo on the trio, slashing $400 off all of their prices. The catch? Well, there's two actually. First, you need to be okay with purchasing an unlocked model, because only those benefit from this deal. Second, you need to trade-in a qualifying device. Let's see what those are: we're talking Galaxy Note9, Note8, Galaxy S9, S9+, iPhone XS, XS Max, XR,...