Another way to get the scrolls is to make a deal you can negotiate through NPC Watson within Hosidius House. He will give you the RS gold Master Clue Scroll to get four other scrolls - Easy, Medium, Hard and Elite. This is a great way to dispose of scrolls you can't complete. If you're stuck with a particular puzzle, you can give it to Watson and exchange it for a new one to start from scratch.
There is also the possibility that you'll get you receive a Clue Scroll drop from skilling. Chances of getting one rises with the quality of the material you're working with. For instance, if you are cutting wood, you'll get Clue Scrolls more often from Yew trees than the regular ones, and when Mining for instance, you'll receive more clues coming from Runite rock than Iron. When you are attempting to master your skills, you stand a 28.5 percent chance of getting Beginner or an easy Clue Scroll, 21.4% of the chance a Medium one, 14.2% for a Hard one, and 7.1 percentage chance to become Elite.
Another method of acquiring Clue Scrolls (and probably the fastest) is to buy Implings that were stored in a jar. Opening said impling containers can result in an Clue Scroll reward. If you're looking to gain quick access to the Treasure Trail of cheap OSRS gold your choice You can choose this method. However, this is a costly method. You will need to spend plenty of money if want to get quality difficulty scrolls that aren't found in Jars.