From his Nictotine article, gum or patch. But e-cig might be fine too if the parts don't have lead or other hazardous substances in them, modulo maybe higher risk of addiction.
Compared to e-cigs, sure. Compared to food, or conventional cigarettes ... they're really really cheap. 96 x2mg gums for $22 comes out to 45¢/mg. I use maybe 0-2 (edit: gums (90¢-$1.80)) a day (I probably save at least that much by making sandwiches for lunch / not eating out -- I work from home).