In light of Ava's Nuby spouts biting the dust and me not being able to find the replacements without having to buy new cups altogether, I was thinking it would make more sense to go ahead and get some kind of big kid cup (something she can use with a lid if needed but can also practice without a lid). Any suggestions? The Tupperware tumblers (shown below) are the only thing that come to mind for something like this but I can't find any reviews or anything saying if they are BPA free or not?

Re: Tupperware? (sippy cup related... again)
I stand corrected. None of their children's products have BPA: https://www.tupperware.com/coe/app/tup_widget.show_page?fv_page_code=safetyqa&fv_section_name=help&fv_category_code=search&fv_item_category_code=200550.
We have some of the 11 oz Impressions tumblers. They're pretty awesome. Maybe now I'll even be willing to put them in the dishwasher. I never did since I thought they had BPA (and somehow hand washing them made me feel better about it).
Very late to the convo but we have these cups and they are Isabelle's favorites. I also like the size of them b/c I don't feel like she can fill up on her drink like she can with some of the other sippys out there.
Michelle