In the Lumbridge Swamp Caves which has a candle lantern (or black candle lantern) while in the backpack, should you fall short the jumps onto stepping stones and "swim on the surface area", you will receive a candle (or black candle) plus some broken glass. Ecoline has good pricing with https://glass-near-me55186.shotblogs.com/considerations-to-know-about-broken-glass-45752490