Bulk wax pellets in a ziplock bag.  Zero fanciness but a lot of wax for the lowest cost.

Just melt 3 pellets in the spoon over a tea candle, pour and stamp!  Don't overheat the wax - this will result in a thin seal, as soon as the wax is melted you are ready to pour.  For ease in making sure each seal is the right way up, put a mark on the seal with a sharpie.

Orders over $50 ship free within New Zealand