How to Get Law Runes on RuneScape if You're Not a Member

Buying Law Runes

Go into a semi-crowded area such as the bank in Varrock.

Say: "Buying laws for 300 gp each! (Your User-name) "

Trade with another player who wants to. Make sure you pay a fair price.

Once you acquire the law runes, use them in any way you wish such as teleporting.

Law Rune Drops

Find a monster that drops law runes. Suggested targets are: Barbarians (level 9-17), Gunthar the brave (level 29) there are only one in Barbarians Village, Dark wizards (level 7 and 20), Hobgoblins (level 28), and Hill Giants (level 28).

Higher levels may want to fight ice warriors (level 57). They are stronger, but drop law runes more frequently. About 10 per 15.

Cockroach soldiers (level 83) in the Stronghold of Player Safety frequently drop 10-15 law runes.

Go to the monster spawn points properly equipped, with lots of food, and kill as many as you can before you run out of food.

Fighting these monsters is not recommended for players under level 35.

You may also get lucky at wizards tower,wizards may drop law runes(level 9).

Grand Exchange

Save up enough money for laws. There are about 240-350gp. With a High Alchemy reward, they are around 144 gp, and with Low Alchemy, they're about 96gp.

Go to the Grand Exchange located Northeast of Varrock.

Buy them in grand exchange and use them to train for magic.