EDIT: Shortly after writing the answer below, I received an email from Mr. Weinstein that he is indeed "winding down the company". That explains it.
They are, it turns out, still in business, but a) weren't aware of the 800 # issue and b) hadn't removed Julie's email address from that Contact Us page. If you need to reach someone, the following contact info works: Cary Weinstein
BTW Enterprises Inc.
329 W. 18th St. #406
Chicago, IL 60616
I've found out that the Ameda 4 oz breast milk storage bottles also fit in this rack. They're BPA free very sturdy and easy to use, so far no leaks with the ones I've used. You can store milk in freezer or fridge.