Piyo piyo has one such kind of bottle. Definitely v. ex. You can get them from Kiddy Palace. My mum said we all survived using the normal plastic bottles, so what's the big deal, right? Just make sure we rinse the bottle with boiled water below 50 deg celsius.
She's definitely sucking for comfort...you can either let her suck for comfort so as to stimulate more breastmilk or give her the pacifier. I gave mine pacifier and she decided not to latch on my breast anymore.