Simple Steps
Example : 19 Mage Twink.
-Go to several innkeepers (maybe with mages help)
-Take 20 Pyroblast Cinnamon Ball & Soothing Spearmint Candy
-So 20x6SP + 20x11SP = 340 SPELL POWER (Not bad for 19lvl)
-You can also try gettin even more as these items stack at 200.
First post, so dont flame me if im wrong