My stetchmarks are amazing. They've elicited gasps from friends! My previously unmarked body is now covered in bright red stretchmarks. Since dd was worth it, I just accept them. Anyway, I lotioned on cocoa butter during pregnancy to no avail. I've used it afterwards, along with vitamin E oil and Mederma. I think there's nothing we can really do. It's determined by your skin and what it's genetically programmed to do.
But if any of those expensive creams work, I might give them a shot! Anyone tried 'em?