Another good trick to have a flagship journal publish your work if you're a non-member: ask a professor at your school if he'd be willing to become a co-author of your article. This is exactly what one of my classmates did, even though he's a non-member, and surprise surprise, his article is getting published in our journal this year. Granted he is not listed as the main author, even though he is the one who wrote it, but he is still getting published, and no matter how you look at it, that's an achievement.