Trading in the 'Grand Exchange' can feel like a little scavenger hunt if you like the thrill of saving a few extra coins, and the 'Amulet of Fury' (the thing people mean by 'fury') is one of those items where a smart buy can net you a nice margin or just keep your gear budget healthy. I usually start by checking real-time price tools — the built-in GE window in 'Old School RuneScape' shows current buy and sell offers, but I like to cross-reference with third-party trackers so I can see price history and trends. That tells me whether the current low sell price is a short-lived dip or part of a steady drop.
If you want the absolute cheapest route and are patient, set a buy offer a few hundred to a couple thousand GP under the current cheapest sell offer depending on how volatile the market is. This won't get you an instant fulfilment, but if sellers lower their prices you'll pick one up without overpaying. If you need it immediately, place your buy offer at the current lowest sell price (or a coin or two above it) to match sellers instantly. Undercutting by a single coin is usually how sellers jockey, so be mindful of tiny shifts.
Timing matters more than people give it credit for. Off-peak hours (late night in the game's main time zone) sometimes yield better quotes because fewer players are listing; holiday spikes or updates can also shift the price. Avoid private trades unless you trust the other person — the GE exists to prevent scams, and the safety premium is worth a few hundred coins on high-value items. For convenience, use a trusted client or plugin with a GE helper: those give quick graphs, median prices, and can show recent trade volume so you know whether the item is moving fast.
I usually keep a small watchlist and set my buy offers, then get on with skilling or quests. Patience plus a little market awareness is the cheapest combination: you either snipe a low sell or your buy gets filled when the market dips. Honestly, scoring a 'fury' for thousands less than the usual was one of my most satisfying GE moments — felt like finding a rare drop in a chest, and I still grin about it.