(Image credit: Samsung)

Amazon Prime Day is winding down, but there’s still time to score a last-minute deal on a TV before the event ends. For some of those TVs, it’ll be the last big sale they see.Take the Samsung S90F, for instance. This showstopping OLED is one of my favorite Samsung TVs, but because it was recently replaced by its successor, the Samsung S90H, today might be your last chance to get your hands on it before its stock runs out.Right now, the 48-inch Samsung S90F is $797 at Amazon during the last day of Prime Day. It’s the lowest price on record for this modestly sized, mid-range OLED, and it won’t be around forever.OLED TVs are known for their sensational contrast. Unlike LCD TVs (which rely on some sort of backlight system), every pixel in the S90F's display is self-illuminating. This has some seriously positive impacts on its performance, as self-lit pixels allow for perfect black levels and surgical contrast control.The S90F may not get as bright as a more-expensive, flagship-level OLED TV, but thanks to its deep, inky black levels, its highlights pop in a way that LCD TVs can't quite replicate. This translates to an incredible sense of visual depth.One major reason why the S90F is one of my favorite OLED bargains is because it offers almost all of the streaming- and gaming-related features you'll find in higher-end Samsung TVs. The S90F supports 4K gaming at 120Hz (and up to 144Hz when connected to a gaming PC) across all four of its HDMI 2.1-compatible inputs. FreeSync support and G-Sync compatibility are here, as well as Samsung's Gaming Hub software suite.If the 48-inch S90F is too small for your living space, it's worth noting that the 65-inch Samsung S90F is $1,197 at Amazon right now, which is also the all-time lowest price for that model. As is the case with the 48-inch version, the 65-inch S90F won't be around much longer.