It is sometimes really hard for new players to get their hand on these. The best way is to do Praire Cave and get those ones from the bosses.
@iOverful: Not so much an option to buy from AH because 1g is still alot at lvl 20, and full set might cost 15g :S (crippling to money you can make at that level).
I am making a 'no money' warrior atm and seeing how hard it is for new players. Things get easy from Bear rep onwards tho.