As someone with the same chest size, I can say that I've tried their sports bras, and even ones that are 34A. Doesn't really help. I now use the (xs 997) binders from Underworks and I still think if people stared, they'd be able to tell that it's not flat, but it's made the biggest difference. I know that's out of your budget right now, but I'd recommend saving up for 'em (and definitely not try the DIY ace bandage method that could cause some serious problems).
I also think the model probably is naturally a much smaller size to begin with.