The Dr. Browns wide mouth are supposed to fit this pump... well they don't and I can't send back the bottles because I've done sterilizated them. Ugh
That sucks! Do you still have the boxes? I'd still be taking that back! Either that or look on the back of the box and see if there's a company contact number. Maybe they'd be able to help you.
Other than that, list them on Ebay. You'd be surprised the stuff people will buy.