I searched for coal bunkers a couple of years ago and found them to be pricey (€120 and upwards).
I found a novel solution - a colourful double size toy box! It cost €75, holds 2 bags of coal (I keep the coal in their bags) plus briquettes, logs, tinder sticks and firelighters. It's weatherproof, and makes a change from black or grey!
Here's a link to the single-size version, available at Woodies (where I got the double). And yes, my coal bunker is that colourful!!
http://www.woodiesdiy.com/productdetail.aspx?pid=6819&loc=P&catid=9.5