OLED monitors are super cool with their vibrant colors and perfect black levels. But they’re not exactly affordable, at least not yet — it’s notable when we see a model come to market at under a thousand bucks. So that makes the Acer Predator X27U a bargain, at least in relative terms, when it’s discounted from its $999.99 retail price down to $599.99. The deal popped up on Newegg initially, but as is often the case, Amazon has matched the price. The X27U is fairly typical for a 27-inch gaming model, boasting the popular 2560×1440 resolution (also known as “2K” in the usual 16:9 aspect ratio) …