Sharpie Twin Tip Permanent Markers – Fine & Ultra-Fine Points (£12.59 / £11.89 max S&S)

Sharpie Twin Tip Permanent Markers is down to £13.99 at Amazon, about 35% below its typical price of around £21.68, and this is the lowest Amazon price in the last 90 days. Sold and dispatched by Amazon, rated 4.7 out of 5 from 11,203 reviews.
Key features from the listing:
Proudly permanent ink marks on paper, plastic, metal and most other surfaces
Intensely bold black colour creates lasting impressions
Remarkably resilient ink dries quickly and resists fading and water
Increased functionality with both fine and ultra-fine tips in one marker
Worth grabbing at this price if you need one – Amazon prices can change quickly, so it may not last long.