Bad stretch marks because of pregnancy!?

i am caramel color (light brown) and because of my pregnancy i've gotten black, i mean bbblllaaacckk stretchmarks all on my sides, my stomach, my thighs, and my behind. i've never had them before and i know that during pregnancy women get them. but mine are just ssssooo dark!!! i've tried palmers cocoa er faithfully and it really just doesnt work for me. i've been told to use "bio-oil" but didnt know where to get it from. where can you get it from in the US (Buffalo,NY) to be exact...? thanx for your help!