Death's Coffer

The coffer credits an item at 105% of its GE guide price (10,000+ gp only), but you pay the instant-buy price to get it — so your real edge is 105% of guide − what you pay. Ranked by ROI (return per gp): items where the spread is tight enough to actually clear a profit float to the top; ones where you'd overpay past the 5% are dropped.

Note: the coffer uses the slow GE guide price. When an item is crashing, its guide can sit above the live price for a bigger edge — but that needs a live guide-price feed the price API doesn't expose, so these figures use the live mid as the guide and cap near 5%.