Teleport to Varrock tabs are worth coins, and are generally in high demand, as they're one of the most versatile teleportation items. The tablets are made on any lectern in a player-owned house study. This does not have to be your house. Using a ring of dueling to bank at Castle Wars, and using the house teleport tablet to access your house quickly, you can create an inventory of 25 Varrock teleport tablets per trip (two inventory slots are used for the air and law runes, and one for the house teleport tablet).