How should I get a wife?

my girlfriend in asia wants $700/month. that is kind of expensive for me. i'm not rich. i know that myanmar and cambodia are full of poor desperate girls willing to marry foreign men for less. should i marry my girlfriend or search for something better? i am looking for a wife that won't cost me a fortune and that will give me everyday. also, i don't want her to run off as soon as i get her over here on a fiance visa.