You lost 200 lbs? Amazing. Hopefully this was done the old fashioned way, that would be truly inspiring.
The best way to reduce the appearance of stretch marks is to prevent them by applying cocoa butter or bio oil as your skin is stretching. Since you are far removed from that point in time, you basically have to wait a considerable amount of time in hopes that they fade, or have microdermal abrasion surgery. Some say it costs up to $1500, which in my mind can be a lot cheaper than pinning your hopes on cheap oils and having to apply them every single day.
Go you! Congrats on all of your weight loss success, that's a wonderful story! I unfortunately know nothing about stretch marks but I know that my best friend used some creme to get rid of hers after she had her son. I'll ask her today and get back to ya.