The prices on the dual-SIM variants of both the Samsung S8 and the S8+ have been steadily dropping over the past few weeks on eBay, first to $670 and $770 and then to $640 and $728, respectively. Now, the same seller has brought down the price on either model by another $40, putting the S8 at a penny under 600 bucks, and the S8+ at just $689.99 — representing a total savings of around $150 compared to what you would find if you tried to buy the same phones elsewhere.

This seller has a pretty solid track record, with a 99.7% positive feedback rating and a top rated certificate from eBay, so there shouldn't be much reason to be concerned about where you're buying from.